chant __ARM_ARCH_4__ to __ARM_ARCH_4T__, to reflect known android targets

git-svn-id: http://skia.googlecode.com/svn/trunk@467 2bbb7eff-a529-9590-31e7-b0007b416f81

include/core/SkMath.h

@@ -164,7 +164,7 @@ static inline int SkNextLog2(uint32_t value) {
 */
 #if defined(__arm__) \
   && !defined(__thumb__) \
-  && !defined(__ARM_ARCH_4__) \
+  && !defined(__ARM_ARCH_4T__) \
   && !defined(__ARM_ARCH_5T__)
     static inline int32_t SkMulS16(S16CPU x, S16CPU y) {
         SkASSERT((int16_t)x == x);