Make both SK_API definition points identical and order independent.

include/core/SkPreConfig.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.
  */
 
 // IWYU pragma: private, include "SkTypes.h"
 
 #ifndef SkPreConfig_DEFINED
@@ skipping 191 matching lines @@
 #if !defined(SK_ARM_HAS_NEON) && !defined(SK_BUILD_NO_OPTS) && (defined(__ARM_NEON__) || defined(__ARM_NEON))
     #define SK_ARM_HAS_NEON
 #endif
 
 //////////////////////////////////////////////////////////////////////
 
 #if !defined(SKIA_IMPLEMENTATION)
     #define SKIA_IMPLEMENTATION 0
 #endif
 
-#if defined(SKIA_DLL)
-    #if defined(SK_BUILD_FOR_WIN32)
-        #if SKIA_IMPLEMENTATION
-            #define SK_API __declspec(dllexport)
+#if !defined(SK_API)
+    #if defined(SKIA_DLL)
+        #if defined(SK_BUILD_FOR_WIN32)
+            #if SKIA_IMPLEMENTATION
+                #define SK_API __declspec(dllexport)
+            #else
+                #define SK_API __declspec(dllimport)
+            #endif
         #else
-            #define SK_API __declspec(dllimport)
+            #define SK_API __attribute__((visibility("default")))
         #endif
     #else
-        #define SK_API __attribute__((visibility("default")))
+        #define SK_API
     #endif
-#else
-    #define SK_API
 #endif
 
 //////////////////////////////////////////////////////////////////////
 
 /**
  * Use SK_PURE_FUNC as an attribute to indicate that a function's
  * return value only depends on the value of its parameters. This
  * can help the compiler optimize out successive calls.
  *
  * Usage:
@@ skipping 27 matching lines @@
  *
  * NOTE: Clang/ARM (r161757) does not support the 'optimize' attribute.
  */
 #if SK_HAS_ATTRIBUTE(optimize)
 #   define SK_ATTRIBUTE_OPTIMIZE_O1 __attribute__((optimize("O1")))
 #else
 #   define SK_ATTRIBUTE_OPTIMIZE_O1 /* nothing */
 #endif
 
 #endif