Fix x86 build for SSSE3.

These functions were previously defined in a C file. The file was
renamed to C++, but the extern "C"s were not removed.

Change-Id: I62ec9ba7c73d24c221bbe3f7580cfd7f09bf701c
diff --git a/cpu_ref/rsCpuIntrinsicBlend.cpp b/cpu_ref/rsCpuIntrinsicBlend.cpp
index 2beec3d..27a02b7 100644
--- a/cpu_ref/rsCpuIntrinsicBlend.cpp
+++ b/cpu_ref/rsCpuIntrinsicBlend.cpp
@@ -95,18 +95,18 @@
 #endif
 
 #if defined(ARCH_X86_HAVE_SSSE3)
-extern "C" void rsdIntrinsicBlendSrcOver_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendDstOver_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendSrcIn_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendDstIn_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendSrcOut_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendDstOut_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendSrcAtop_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendDstAtop_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendXor_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendMultiply_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendAdd_K(void *dst, const void *src, uint32_t count8);
-extern "C" void rsdIntrinsicBlendSub_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendSrcOver_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendDstOver_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendSrcIn_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendDstIn_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendSrcOut_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendDstOut_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendSrcAtop_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendDstAtop_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendXor_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendMultiply_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendAdd_K(void *dst, const void *src, uint32_t count8);
+extern void rsdIntrinsicBlendSub_K(void *dst, const void *src, uint32_t count8);
 #endif
 
 void RsdCpuScriptIntrinsicBlend::kernel(const RsExpandKernelParams *p,