[POWERPC] ppc math-emu needs -fno-builtin-fabs for math.c and fabs.c

... since they deal with internal function with that name.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/math-emu/Makefile

@@ -11,3 +11,6 @@ obj-$(CONFIG_MATH_EMULATION)	+= fabs.o fadd.o fadds.o fcmpo.o fcmpu.o \
 					mcrfs.o mffs.o mtfsb0.o mtfsb1.o \
 					mtfsf.o mtfsfi.o stfiwx.o stfs.o \
 					udivmodti4.o
+
+CFLAGS_fabs.o = -fno-builtin-fabs
+CFLAGS_math.o = -fno-builtin-fabs