[spu2null, gsnull, padnull]: Use the same configuration interface as others null plugins. Drop the glade dependency ^^

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@3194 96395faa-99c1-11dd-bbfe-3dabce05a288

plugins/GSnull/GS.cpp

@@ -100,6 +100,10 @@ void SysPrintf(const char *fmt, ...)
 }
 
 // basic funcs
+EXPORT_C_(void) GSsetSettingsDir(const char* dir)
+{
+	s_strIniPath = (dir == NULL) ? "inis/" : dir;
+}
 
 EXPORT_C_(s32) GSinit()
 {