remove gcc OPT_FLAGS from darwin_app/Makefile because Apple's compiler throws an error on it

remove pentium4 arch (I'm on a MacBook Air-- not sure if that would compile on some other Mac)

packages/darwin_app/Makefile

@@ -26,7 +26,7 @@ WISH_CONTENTS = "$(WISH)/Contents"
 # http://developer.apple.com/releasenotes/DeveloperTools/RN-GCC4/
 # http://hpc.sourceforge.net/
 
-OPT_CFLAGS = -fast -fPIC -ftree-vectorize -ftree-vectorizer-verbose=2
+OPT_CFLAGS = -fast -fPIC -ftree-vectorize
 FAT_FLAGS = -mmacosx-version-min=10.4
 
 # which CPU to compile for
@@ -37,7 +37,7 @@ ifeq ($(TARGET_PLATFORM),i386)
     OPT_CFLAGS += -march=core2 -msse3 -mssse3 -mfpmath=sse
     FAT_FLAGS = -mmacosx-version-min=10.6
   else
-    OPT_CFLAGS += -march=pentium4 -msse3 -mfpmath=sse
+    OPT_CFLAGS += -msse3 -mfpmath=sse
   endif
 else
   OPT_CFLAGS += -mcpu=7450 -mtune=7450