Fix mingw warnings.

crypto/LPdir_win.c

@@ -54,8 +54,6 @@ struct LP_dir_context_st
 
 const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
 {
-  struct dirent *direntry = NULL;
-
   if (ctx == NULL || directory == NULL)
     {
       errno = EINVAL;

crypto/dso/dso_win32.c

@@ -826,7 +826,7 @@ static void *win32_globallookup(const char *name)
 		}
 
 	do	{
-		if (ret = GetProcAddress(me32.hModule,name))
+		if ((ret = GetProcAddress(me32.hModule,name)))
 			{
 			(*close_snap)(hModuleSnap);
 			FreeLibrary(dll);

crypto/engine/eng_padlock.c

@@ -123,9 +123,11 @@ void ENGINE_load_padlock (void)
 #ifdef COMPILE_HW_PADLOCK
 /* We do these includes here to avoid header problems on platforms that
    do not have the VIA padlock anyway... */
-#ifdef _MSC_VER
+#ifdef _WIN32
 # include <malloc.h>
-# define alloca _alloca
+# ifndef alloca
+#  define alloca _alloca
+# endif
 #else
 # include <stdlib.h>
 #endif

e_os.h

@@ -452,7 +452,10 @@ static unsigned int _strlen31(const char *str)
 #      if defined(_WIN32_WCE) && _WIN32_WCE<410
 #        define getservbyname _masked_declaration_getservbyname
 #      endif
-#      include <winsock.h>
+#      if !defined(IPPROTO_IP)
+         /* winsock[2].h was included already? */
+#        include <winsock.h>
+#      endif
 #      ifdef getservbyname
 #        undef getservbyname
          /* this is used to be wcecompat/include/winsock_extras.h */