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.

2 files changed, 12 insertions, 11 deletions

diff --git a/libs/libmdbx/src/cmake/compiler.cmake b/libs/libmdbx/src/cmake/compiler.cmake
index e13225d63d..ab72b897d1 100644
--- a/libs/libmdbx/src/cmake/compiler.cmake
+++ b/libs/libmdbx/src/cmake/compiler.cmake
@@ -231,7 +231,7 @@ else()
   check_compiler_flag("-ggdb" CC_HAS_GGDB)
   check_compiler_flag("-fvisibility=hidden" CC_HAS_VISIBILITY)
   check_compiler_flag("-march=native" CC_HAS_ARCH_NATIVE)
-  check_compiler_flag("-Og" CC_HAS_DEBUG_FRENDLY_OPTIMIZATION)
+  check_compiler_flag("-Og" CC_HAS_DEBUG_FRIENDLY_OPTIMIZATION)
   check_compiler_flag("-Wall" CC_HAS_WALL)
   check_compiler_flag("-Ominimal" CC_HAS_OMINIMAL)
   check_compiler_flag("-ffunction-sections -fdata-sections" CC_HAS_SECTIONS)
@@ -606,8 +606,9 @@ macro(setup_compile_flags)
     if(MSVC_VERSION LESS 1900)
       message(FATAL_ERROR "At least \"Microsoft C/C++ Compiler\" version 19.0.24234.1 (Visual Studio 2015 Update 3) is required.")
     endif()
-    add_compile_flags("CXX" "/Zc:__cplusplus")
-    add_compile_flags("C;CXX" "/W4")
+    if(NOT MSVC_VERSION LESS 1910)
+      add_compile_flags("CXX" "/Zc:__cplusplus")
+    endif()
     add_compile_flags("C;CXX" "/utf-8")
   else()
     if(CC_HAS_WALL)
@@ -771,14 +772,14 @@ endmacro(setup_compile_flags)
 if(CMAKE_CXX_COMPILER_LOADED)
   # determine library for for std::filesystem
   set(LIBCXX_FILESYSTEM "")
-  if(CMAKE_COMPILER_IS_GNUCXX)
-    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
-      set(LIBCXX_FILESYSTEM "stdc++fs")
-    endif()
-  elseif(CMAKE_COMPILER_IS_CLANG)
+  if(CMAKE_COMPILER_IS_CLANG)
     if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
       set(LIBCXX_FILESYSTEM "c++experimental")
-    else()
+    elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
+      set(LIBCXX_FILESYSTEM "stdc++fs")
+    endif()
+  elseif(CMAKE_COMPILER_IS_GNUCXX)
+    if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.3 AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
       set(LIBCXX_FILESYSTEM "stdc++fs")
     endif()
   endif()
diff --git a/libs/libmdbx/src/cmake/utils.cmake b/libs/libmdbx/src/cmake/utils.cmake
index 8e98267f4e..dc6a240e1b 100644
--- a/libs/libmdbx/src/cmake/utils.cmake
+++ b/libs/libmdbx/src/cmake/utils.cmake
@@ -155,7 +155,7 @@ macro(fetch_version name source_root_directory parent_scope)
 
   if(NOT ${name}_GIT_VERSION OR NOT ${name}_GIT_TIMESTAMP OR ${name}_GIT_REVISION STREQUAL "")
     if(GIT AND EXISTS "${source_root_directory}/.git")
-      message(WARNING "Unable to retrive ${name} version from git.")
+      message(WARNING "Unable to retrieve ${name} version from git.")
     endif()
     set(${name}_GIT_VERSION "0;0;0;0")
     set(${name}_GIT_TIMESTAMP "")
@@ -168,7 +168,7 @@ macro(fetch_version name source_root_directory parent_scope)
     endif()
 
     if(NOT ${name}_VERSION)
-      message(WARNING "Unable to retrive ${name} version from \"${version_file}\" file.")
+      message(WARNING "Unable to retrieve ${name} version from \"${version_file}\" file.")
       set(${name}_VERSION_LIST ${${name}_GIT_VERSION})
       string(REPLACE ";" "." ${name}_VERSION "${${name}_GIT_VERSION}")
     else()