Compile SkForceLinking on CMake

src/images/SkForceLinking.cpp

Index: src/images/SkForceLinking.cpp
diff --git a/src/images/SkForceLinking.cpp b/src/images/SkForceLinking.cpp
index 78e53f86d855753d38d908285f0d0a80ffce4cc1..e97106fdf838359cc16aa8df67c2118707df1ed0 100644
--- a/src/images/SkForceLinking.cpp
+++ b/src/images/SkForceLinking.cpp
@@ -14,15 +14,20 @@
 int SkForceLinking(bool doNotPassTrue) {
     if (doNotPassTrue) {
         SkASSERT(false);
+#if defined(SK_HAS_JPEG_LIBRARY)
         CreateJPEGImageEncoder();
+#endif
+#if defined(SK_HAS_WEBP_LIBRARY)
         CreateWEBPImageEncoder();
+#endif
 
         // Only link hardware texture codecs on platforms that build them. See images.gyp
 #ifndef SK_BUILD_FOR_ANDROID_FRAMEWORK
         CreateKTXImageEncoder();
 #endif
 
-#if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_WIN) && !defined(SK_BUILD_FOR_IOS)
+#if !defined(SK_BUILD_FOR_MAC) && !defined(SK_BUILD_FOR_WIN) && !defined(SK_BUILD_FOR_IOS) && \
+    defined(SK_HAS_PNG_LIBRARY)
         CreatePNGImageEncoder();
 #endif
 #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)