doh. make the new S16 and U16 checkers inline



git-svn-id: http://skia.googlecode.com/svn/trunk@442 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/core/SkTypes.h b/include/core/SkTypes.h
index 8961aa0..fa21adc 100644
--- a/include/core/SkTypes.h
+++ b/include/core/SkTypes.h
@@ -151,13 +151,13 @@
 
 /** Returns true if the value can be represented with signed 16bits
  */
-static bool SkIsS16(long x) {
+static inline bool SkIsS16(long x) {
     return (int16_t)x == x;
 }
 
 /** Returns true if the value can be represented with unsigned 16bits
  */
-static bool SkIsU16(long x) {
+static inline bool SkIsU16(long x) {
     return (uint16_t)x == x;
 }