plt not useful for GNU

Author: franksinankaya

src/pal/inc/unixasmmacros.inc

@@ -10,7 +10,11 @@
 #define LOCAL_LABEL(name) L##name
 #else
 #define C_FUNC(name) name
+#ifdef __llvm__
 #define EXTERNAL_C_FUNC(name) C_FUNC(name)@plt
+#else
+#define EXTERNAL_C_FUNC(name) C_FUNC(name)
+#endif
 #define LOCAL_LABEL(name) .L##name
 #endif