Rules.mak: Rearrange appending UCLIBC_EXTRA_CFLAGS to CFLAGS

UCLIBC_EXTRA_CFLAGS is currently added before the OPTIMIZATION flags
and OPTIMIZATION is chosen to be Os by default. But in OE we pass the optimisation
flags through UCLIBC_EXTRA_CFLAGS but they are not effective since -Os is
specified at last. So we need to change the order of these option flags

Signed-off-by: Khem Raj <raj.khem@gmail.com>

Rules.mak

@@ -567,9 +567,6 @@ CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
 	-nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
 	-I$(top_srcdir)libc/sysdeps/linux \
 	-I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
-ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
-CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
-endif
 
 # We need this to be checked within libc-symbols.h
 ifneq ($(HAVE_SHARED),y)
@@ -615,6 +612,9 @@ LDFLAGS += -Wl,-s
 else
 STRIPTOOL := true -Stripping_disabled
 endif
+ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
+CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
+endif
 
 ifeq ($(DOMULTI),y)
 # we try to compile all sources at once into an object (IMA), but