sws: move inline asm hscale to MMX_OBJS

Found-by: jamrial
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/x86/Makefile

 $(SUBDIR)x86/swscale_mmx.o: CFLAGS += $(NOREDZONE_FLAGS)
 
-OBJS                            += x86/hscale_fast_bilinear_simd.o      \
-                                   x86/rgb2rgb.o                        \
+OBJS                            += x86/rgb2rgb.o                        \
                                    x86/swscale.o                        \
                                    x86/yuv2rgb.o                        \
 
+MMX-OBJS                        += x86/hscale_fast_bilinear_simd.o      \
+
 OBJS-$(CONFIG_XMM_CLOBBER_TEST) += x86/w64xmmtest.o
 
 YASM-OBJS                       += x86/input.o                          \