Make Sk32ToBool inline again to silence compiler warning.

include/core/SkTypes.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTypes_DEFINED
 #define SkTypes_DEFINED
 
@@ skipping 351 matching lines @@
  */
 #define SK_InvalidUniqueID  0
 
 /****************************************************************************
     The rest of these only build with C++
 */
 #ifdef __cplusplus
 
 /** 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;
 }
 
 /** Generic swap function. Classes with efficient swaps should specialize this function to take
     their fast path. This function is used by SkTSort. */
 template <typename T> inline void SkTSwap(T& a, T& b) {
     T c(a);
     a = b;
     b = c;
 }
@@ skipping 318 matching lines @@
 
     void*       fPtr;
     size_t      fSize;  // can be larger than the requested size (see kReuse)
     uint32_t    fStorage[kSize >> 2];
 };
 // Can't guard the constructor because it's a template class.
 
 #endif /* C++ */
 
 #endif