mdbx: add mdbx_osal.h with platform-like err codes.

mdbx.h

@@ -52,95 +52,8 @@
 
 #ifndef _MDBX_H_
 #define _MDBX_H_
-#define MDBX_MODE_ENABLED 1
 
-#ifndef __has_attribute
-#	define __has_attribute(x) (0)
-#endif
-
-#ifndef __dll_export
-#	if defined(_WIN32) || defined(__CYGWIN__)
-#		if defined(__GNUC__) || __has_attribute(dllexport)
-#			define __dll_export __attribute__((dllexport))
-#		elif defined(_MSC_VER)
-#			define __dll_export __declspec(dllexport)
-#		else
-#			define __dll_export
-#		endif
-#	elif defined(__GNUC__) || __has_attribute(visibility)
-#		define __dll_export __attribute__((visibility("default")))
-#	else
-#		define __dll_export
-#	endif
-#endif /* __dll_export */
-
-#ifndef __dll_import
-#	if defined(_WIN32) || defined(__CYGWIN__)
-#		if defined(__GNUC__) || __has_attribute(dllimport)
-#			define __dll_import __attribute__((dllimport))
-#		elif defined(_MSC_VER)
-#			define __dll_import __declspec(dllimport)
-#		else
-#			define __dll_import
-#		endif
-#	else
-#		define __dll_import
-#	endif
-#endif /* __dll_import */
-
-#if defined(LIBMDBX_EXPORTS)
-#	define LIBMDBX_API __dll_export
-#elif defined(LIBMDBX_IMPORTS)
-#	define LIBMDBX_API __dll_import
-#else
-#	define LIBMDBX_API
-#endif /* LIBMDBX_API */
-
-#ifdef _MSC_VER
-#pragma warning(push)
-#pragma warning(disable : 4514) /* 'xyz': unreferenced inline function  \
-                                   has been removed */
-#pragma warning(disable : 4710) /* 'xyz': function not inlined */
-#pragma warning(disable : 4711) /* function 'xyz' selected for          \
-                                   automatic inline expansion */
-#pragma warning(disable : 4061) /* enumerator 'abc' in switch of enum   \
-                                   'xyz' is not explicitly handled by a case   \
-                                   label */
-#pragma warning(disable : 4201) /* nonstandard extension used :         \
-                                   nameless struct / union */
-#pragma warning(disable : 4127) /* conditional expression is constant   \
-                                   */
-
-#pragma warning(push, 1)
-#pragma warning(disable : 4530) /* C++ exception handler used, but      \
-                                    unwind semantics are not enabled. Specify  \
-                                    /EHsc */
-#pragma warning(disable : 4577) /* 'noexcept' used with no exception    \
-                                    handling mode specified; termination on    \
-                                    exception is not guaranteed. Specify /EHsc \
-                                    */
-#endif                          /* _MSC_VER (warnings) */
-
-#include <stdarg.h>
-#include <stddef.h>
-#include <stdint.h>
-
-#if defined(_WIN32) || defined(_WIN64)
-#	include <windows.h>
-#	include <winnt.h>
-	typedef unsigned mode_t;
-	typedef HANDLE mdbx_filehandle_t;
-	typedef DWORD mdbx_pid_t;
-	typedef DWORD mdbx_tid_t;
-#else
-#	include <pthread.h> /* for pthread_t */
-#	include <sys/uio.h> /* for truct iovec */
-#	include <sys/types.h> /* for pid_t */
-#	define HAVE_STRUCT_IOVEC 1
-	typedef int mdbx_filehandle_t;
-	typedef pid_t mdbx_pid_t;
-	typedef pthread_t mdbx_tid_t;
-#endif
+#include "mdbx_osal.h"
 
 #ifdef _MSC_VER
 #pragma warning(pop)