iputils: do not compile this for brcm47xx with -O2

ping is now working for me with -Os on brcm47xx.
This revert r26278.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 38389

package/network/utils/iputils/Makefile

@@ -121,10 +121,6 @@ define Package/iputils-traceroute6/description
   Traces path to a network host (IPv6).
 endef
 
-ifeq ($(BOARD),brcm47xx)
-  TARGET_CFLAGS += -O2 
-endif
-
 MAKE_FLAGS += \
 	CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS) $(TARGET_LDFLAGS)" \
 	CONFIG_IPV6="$(CONFIG_IPV6)" \