fix a vphysics crash due to it not being able to find certain functions

failed to dlopen vphysics.so error=/home/user/Projects/tf2_stuff/cloned/team-comtress-2/game/bin/vphysics.so: undefined symbol: __wrap_freopen

Author: ReplayCoding

src/tier1/pathmatch.cpp

@@ -71,7 +71,7 @@ static bool s_bShowDiag;
 
 #define WRAP( fn, ret, ... ) \
 	ret __real_##fn(__VA_ARGS__); \
-	ret __wrap_##fn(__VA_ARGS__)
+	__attribute__((visibility("default"))) ret __wrap_##fn(__VA_ARGS__)
 
 #define CALL( fn ) __real_##fn