Support new mingw stat/stat64 behaviour.

Changes were introduced in the following commit: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/07e34538d5a7d5e86ab47c7ba47becb32f7d827e/

Author: ni4

src/common/file-utils.h

@@ -39,7 +39,8 @@ int     rnp_open(const char *filename, int oflag, int pmode);
 FILE *  rnp_fopen(const char *filename, const char *mode);
 FILE *  rnp_fdopen(int fildes, const char *mode);
 int     rnp_access(const char *path, int mode);
-#ifdef _WIN32 /* Default to __stat64 structure */
+#if defined(_WIN32) && !defined(HAVE_WIN_STAT)
+/* Default to __stat64 structure unless defined by mingw since commit [07e345] */
 #define stat __stat64
 #endif
 int rnp_stat(const char *filename, struct stat *statbuf);

src/lib/CMakeLists.txt

@@ -95,6 +95,15 @@ check_cxx_symbol_exists(_O_BINARY fcntl.h HAVE__O_BINARY)
 check_cxx_symbol_exists(_tempnam stdio.h HAVE__TEMPNAM)
 set(HAVE_ZLIB_H "${ZLIB_FOUND}")
 set(HAVE_BZLIB_H "${BZIP2_FOUND}")
+if (WIN32)
+  include(CheckCSourceCompiles)
+
+  check_c_source_compiles("
+    #include <sys/types.h>
+    #include <sys/stat.h>
+    #include <unistd.h>
+    int main() { struct stat s; return 0; }" HAVE_WIN_STAT)
+endif()
 
 # Checks feature in CRYPTO_BACKEND and puts the result into variable whose name is stored in RESULT_VARNAME variable.
 function(backend_has_feature FEATURE RESULT_VARNAME)

src/lib/config.h.in

@@ -49,6 +49,7 @@
 #cmakedefine HAVE_O_BINARY
 #cmakedefine HAVE__O_BINARY
 #cmakedefine HAVE__TEMPNAM
+#cmakedefine HAVE_WIN_STAT
 
 #cmakedefine CRYPTO_BACKEND_BOTAN
 #cmakedefine CRYPTO_BACKEND_BOTAN3