* Fix various warnings with GCC and clang

Makefile

@@ -276,7 +276,7 @@ ifneq (,$(findstring "$(PLATFORM)", "linux" "gnu_kfreebsd" "kfreebsd-gnu"))
   endif
 
   BASE_CFLAGS = -Wall -fno-strict-aliasing -Wimplicit -Wstrict-prototypes \
-    -Wno-self-assign -pipe -DUSE_ICON
+    -pipe -DUSE_ICON
   CLIENT_CFLAGS += $(SDL_CFLAGS)
 
   OPTIMIZEVM = -O3 -funroll-loops -fomit-frame-pointer
@@ -902,6 +902,10 @@ else
   RENDERER_LIBS += -ljpeg
 endif
 
+ifeq ("$(CC)", $(findstring "$(CC)", "clang" "clang++"))
+  BASE_CFLAGS += -Qunused-arguments
+endif
+
 ifdef DEFAULT_BASEDIR
   BASE_CFLAGS += -DDEFAULT_BASEDIR=\\\"$(DEFAULT_BASEDIR)\\\"
 endif