fixed windows symbol exports

src/physfs.h

@@ -225,7 +225,7 @@ extern "C" {
 
 #if defined(PHYSFS_DECL)
 /* do nothing. */
-#elif defined(_MSC_VER)
+#elif defined(_WIN32)
 #define PHYSFS_DECL __declspec(dllexport)
 #elif defined(__SUNPRO_C)
 #define PHYSFS_DECL __global

src/physfs_internal.h

@@ -69,7 +69,7 @@ extern "C" {
    All file-private symbols need to be marked "static".
    Everything shared between PhysicsFS sources needs to be in this
    file between the visibility pragma blocks. */
-#if PHYSFS_MINIMUM_GCC_VERSION(4,0) || defined(__clang__)
+#if !defined(_WIN32) && (PHYSFS_MINIMUM_GCC_VERSION(4,0) || defined(__clang__))
 #define PHYSFS_HAVE_PRAGMA_VISIBILITY 1
 #endif