mv dct_sse2.c dct_sse2_intrinsics.c to avoid collision

Change-Id: Id786be31da3c91d95d2955aa569ecdc6e66650df

vp9/vp9cx.mk

@@ -110,10 +110,10 @@ VP9_CX_SRCS-$(ARCH_X86)$(ARCH_X86_64) += encoder/x86/vp9_quantize_mmx.asm
 VP9_CX_SRCS-$(ARCH_X86)$(ARCH_X86_64) += encoder/x86/vp9_encodeopt.asm
 VP9_CX_SRCS-$(ARCH_X86_64) += encoder/x86/vp9_ssim_opt.asm
 
-VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_dct_sse2.c
+VP9_CX_SRCS-$(HAVE_SSE2) += encoder/x86/vp9_dct_sse2_intrinsics.c
 ifeq ($(HAVE_SSE2),yes)
-vp9/encoder/x86/vp9_dct_sse2.c.d: CFLAGS += -msse2
-vp9/encoder/x86/vp9_dct_sse2.c.o: CFLAGS += -msse2
+vp9/encoder/x86/vp9_dct_sse2_intrinsics.c.d: CFLAGS += -msse2
+vp9/encoder/x86/vp9_dct_sse2_intrinsics.c.o: CFLAGS += -msse2
 endif