MinGW support: Add patches-win32/03-mingw32.patch

This commit integrates changes originally added to the project
as python-cmake-buildsystem/python-cmake-buildsystem@18de7ac65 (Fix the nt module)
and python-cmake-buildsystem/python-cmake-buildsystem@a2606f959 (config-mingw: Add
(i686|x86_64)-w64-mingw32 toolchain support from MXE)

Co-authored-by: David Sansome <me@davidsansome.com>

Author: jcfr

Modules/posixmodule.c

@@ -134,7 +134,20 @@ corresponding Unix manual entries for more information on calls.");
 #else
 #if defined(PYOS_OS2) && defined(PYCC_GCC) || defined(__VMS)
 /* Everything needed is defined in PC/os2emx/pyconfig.h or vms/pyconfig.h */
-#else                   /* all other compilers */
+#else
+#if defined(__MINGW32__)
+#define HAVE_EXECV      1
+#if defined(__USLC__) && defined(__SCO_VERSION__)       /* SCO UDK Compiler */
+#define HAVE_FORK1      1
+#endif
+#define HAVE_GETCWD     1
+#define HAVE_OPENDIR    1
+#define HAVE_PIPE       1
+#ifndef __rtems__
+#define HAVE_POPEN      1
+#endif
+#define HAVE_SYSTEM     1
+#else /* all other compilers */
 /* Unix functions that the configure script doesn't check for */
 #define HAVE_EXECV      1
 #define HAVE_FORK       1
@@ -156,13 +169,14 @@ corresponding Unix manual entries for more information on calls.");
 #define HAVE_SYSTEM     1
 #define HAVE_WAIT       1
 #define HAVE_TTYNAME    1
+#endif  /* __MINGW32__ */
 #endif  /* PYOS_OS2 && PYCC_GCC && __VMS */
 #endif  /* _MSC_VER */
 #endif  /* __BORLANDC__ */
 #endif  /* ! __WATCOMC__ || __QNX__ */
 #endif /* ! __IBMC__ */
 
-#ifndef _MSC_VER
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
 
 #if defined(__sgi)&&_COMPILER_VERSION>=700
 /* declare ctermid_r if compiling with MIPSPro 7.x in ANSI C mode
@@ -214,7 +228,7 @@ extern int lstat(const char *, struct stat *);
 #endif /* HAVE_LSTAT */
 #endif /* !HAVE_UNISTD_H */
 
-#endif /* !_MSC_VER */
+#endif /* !_MSC_VER && !__MINGW32__ */
 
 #ifdef HAVE_UTIME_H
 #include <utime.h>
@@ -259,7 +273,7 @@ extern int lstat(const char *, struct stat *);
 #endif
 #endif
 
-#ifdef _MSC_VER
+#if defined(_MSC_VER) || defined(__MINGW32__)
 #ifdef HAVE_DIRECT_H
 #include <direct.h>
 #endif
@@ -275,7 +289,7 @@ extern int lstat(const char *, struct stat *);
 #include <shellapi.h>   /* for ShellExecute() */
 #define popen   _popen
 #define pclose  _pclose
-#endif /* _MSC_VER */
+#endif /* _MSC_VER || __MINGW32__ */
 
 #if defined(PYCC_VACPP) && defined(PYOS_OS2)
 #include <io.h>
@@ -1514,7 +1528,7 @@ _pystat_fromstructstat(STRUCT_STAT *st)
     return v;
 }
 
-#ifdef MS_WINDOWS
+#if defined(MS_WINDOWS) && !defined(__MINGW32__)
 
 /* IsUNCRoot -- test whether the supplied path is of the form \\SERVER\SHARE\,
    where / can be used in place of \ and the trailing slash is optional.
@@ -9332,7 +9346,7 @@ all_ins(PyObject *d)
 }
 
 
-#if (defined(_MSC_VER) || defined(__WATCOMC__) || defined(__BORLANDC__)) && !defined(__QNX__)
+#if (defined(_MSC_VER) || defined(__WATCOMC__) || defined(__BORLANDC__) || defined(__MINGW32__)) && !defined(__QNX__)
 #define INITFUNC initnt
 #define MODNAME "nt"