libmdbx: switch to original amalgamated source code (v0.9.1.18)

Amalgamated source code is the recommended form for
embedding libmdbx in non-CMake build systems. This amalgamated
version contains a minimum of files, is fully ready for use,
and make impossible a number of errors.

To upgrade or switch to a different version, just unpack
to the `src` subdirectory a corresponding `libmdbx-amalgamated-X_Y_Z.zip`
at the https://github.com/erthink/libmdbx/releases.

For instance, the https://github.com/erthink/libmdbx/releases/download/v0.9.2/libmdbx-amalgamated-0_9_2.zip
for the next release.

--

Minimal changes have been made to the build configuration:

1. For use the standard `DllMain()` entry of libmdbx:
   - added the `MDBX_BUILD_SHARED_LIBRARY=1` option;
   - removed the `MDBX_CONFIG_MANUAL_TLS_CALLBACK` option;
   - deleted the `miranda.c` file containing only `DllMain()`
     with the `mdbx_dll_handle()` call, now this is done by the library itself.

2. Removed refs to extra files (that missing in the amalgamated source code):
   - for building `libmdbx.dll` only the `mdbx.h` and `mdbx.c` are used,
     but not `mdbx.c++` for a C++ API;
   - for building the `mdbx_chk`, `mdbx_load`, and `mdbx_dump` utilities
     only it own sources are used.

--

Last libmdbx changes:

 - Fixed missing installation of `mdbx.h++`.
 - Fixed use of obsolete `__noreturn`.
 - Fixed use of `yield` instruction on ARM if unsupported.
 - Added pthread workaround for buggy toolchain/cmake/buildroot.
 - Fixed use of `pthread_yield()` for non-GLIBC.
 - Fixed use of `RegGetValueA()` on Windows 2000/XP.
 - Fixed use of `GetTickCount64()` on Windows 2000/XP.
 - Fixed opening DB on a network shares (in the exclusive mode).
 - Fixed copy&paste typos.
 - Fixed minor false-positive GCC warning.

1 files changed, 0 insertions, 112 deletions

diff --git a/libs/libmdbx/src/example/example-mdbx.c b/libs/libmdbx/src/example/example-mdbx.c
deleted file mode 100644
index 0a9e7ed601..0000000000
--- a/libs/libmdbx/src/example/example-mdbx.c
+++ /dev/null
@@ -1,112 +0,0 @@
-/* MDBX usage examle
- *
- * Do a line-by-line comparison of this and sample-bdb.txt
- */
-
-/*
- * Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
- * Copyright 2017 Ilya Shipitsin <chipitsine@gmail.com>.
- * Copyright 2012-2015 Howard Chu, Symas Corp.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted only as authorized by the OpenLDAP
- * Public License.
- *
- * A copy of this license is available in the file LICENSE in the
- * top-level directory of the distribution or, alternatively, at
- * <http://www.OpenLDAP.org/license.html>.
- */
-
-#include "mdbx.h"
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(int argc, char *argv[]) {
-  (void)argc;
-  (void)argv;
-
-  int rc;
-  MDBX_env *env = NULL;
-  MDBX_dbi dbi = 0;
-  MDBX_val key, data;
-  MDBX_txn *txn = NULL;
-  MDBX_cursor *cursor = NULL;
-  char sval[32];
-
-  rc = mdbx_env_create(&env);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_env_create: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_env_open(env, "./example-db",
-                     MDBX_NOSUBDIR | MDBX_COALESCE | MDBX_LIFORECLAIM, 0664);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_env_open: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-
-  rc = mdbx_txn_begin(env, NULL, 0, &txn);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_txn_begin: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_dbi_open(txn, NULL, 0, &dbi);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_dbi_open: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-
-  key.iov_len = sizeof(int);
-  key.iov_base = sval;
-  data.iov_len = sizeof(sval);
-  data.iov_base = sval;
-
-  sprintf(sval, "%03x %d foo bar", 32, 3141592);
-  rc = mdbx_put(txn, dbi, &key, &data, 0);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_put: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_txn_commit(txn);
-  if (rc) {
-    fprintf(stderr, "mdbx_txn_commit: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  txn = NULL;
-
-  rc = mdbx_txn_begin(env, NULL, MDBX_RDONLY, &txn);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_txn_begin: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-  rc = mdbx_cursor_open(txn, dbi, &cursor);
-  if (rc != MDBX_SUCCESS) {
-    fprintf(stderr, "mdbx_cursor_open: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  }
-
-  int found = 0;
-  while ((rc = mdbx_cursor_get(cursor, &key, &data, MDBX_NEXT)) == 0) {
-    printf("key: %p %.*s, data: %p %.*s\n", key.iov_base, (int)key.iov_len,
-           (char *)key.iov_base, data.iov_base, (int)data.iov_len,
-           (char *)data.iov_base);
-    found += 1;
-  }
-  if (rc != MDBX_NOTFOUND || found == 0) {
-    fprintf(stderr, "mdbx_cursor_get: (%d) %s\n", rc, mdbx_strerror(rc));
-    goto bailout;
-  } else {
-    rc = MDBX_SUCCESS;
-  }
-bailout:
-  if (cursor)
-    mdbx_cursor_close(cursor);
-  if (txn)
-    mdbx_txn_abort(txn);
-  if (dbi)
-    mdbx_dbi_close(env, dbi);
-  if (env)
-    mdbx_env_close(env);
-  return (rc != MDBX_SUCCESS) ? EXIT_FAILURE : EXIT_SUCCESS;
-}