Corrected __EXPORT__ test for Solaris.

src/physfs.h

@@ -221,7 +221,7 @@ extern "C" {
 #define __EXPORT__ __declspec(dllexport)
 #elif (defined __SUNPRO_C)
 #define __EXPORT__ __global
-#elif ((__GNUC__ >= 3) && (!__EMX__))
+#elif ((__GNUC__ >= 3) && (!__EMX__) && (!sun))
 #define __EXPORT__ __attribute__((visibility("default")))
 #else
 #define __EXPORT__