Fix for pthreads on MSYS2 & MINGW

Author: Lealem Amedie

wolfssl/wolfcrypt/types.h

@@ -1377,8 +1377,7 @@ typedef struct w64wrapper {
         typedef unsigned int  THREAD_RETURN;
         typedef size_t        THREAD_TYPE;
         #define WOLFSSL_THREAD
-    #elif (defined(_POSIX_THREADS) || defined(HAVE_PTHREAD)) && \
-        !defined(__MINGW32__)
+    #elif (defined(_POSIX_THREADS) || defined(HAVE_PTHREAD))
         #ifndef __MACH__
             #include <pthread.h>
             typedef struct COND_TYPE {

wolfssl/wolfcrypt/wc_port.h

@@ -60,6 +60,10 @@
 
 /* THREADING/MUTEX SECTION */
 #ifdef USE_WINDOWS_API
+    #if defined(MINGW32) && !defined(SINGLE_THREADED)
+        #define WOLFSSL_PTHREADS
+        #include <pthread.h>
+    #endif
     #ifdef WOLFSSL_GAME_BUILD
         #include "system/xtl.h"
     #else
@@ -739,10 +743,10 @@ WOLFSSL_ABI WOLFSSL_API int wolfCrypt_Cleanup(void);
 #endif
 
     #ifndef MAX_FILENAME_SZ
-        #define MAX_FILENAME_SZ  256 /* max file name length */
+        #define MAX_FILENAME_SZ  260 + 1 /* max file name length */
     #endif
     #ifndef MAX_PATH
-        #define MAX_PATH 256
+        #define MAX_PATH 260 + 1
     #endif
 
     WOLFSSL_LOCAL int wc_FileLoad(const char* fname, unsigned char** buf,