Make Sk32ToBool inline again to silence compiler warning.
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2007753003

Review-Url: https://codereview.chromium.org/2007753003
diff --git a/include/core/SkTypes.h b/include/core/SkTypes.h
index 13b662a..baa6ac1 100644
--- a/include/core/SkTypes.h
+++ b/include/core/SkTypes.h
@@ -369,7 +369,7 @@
 
 /** Faster than SkToBool for integral conditions. Returns 0 or 1
 */
-static constexpr int Sk32ToBool(uint32_t n) {
+static inline constexpr int Sk32ToBool(uint32_t n) {
     return (n | (0-n)) >> 31;
 }