Update source to SDL2 2.0.12

Edward Rudd

2020-05-02 03f8528315fa46c95991a34f3325d7b33ae5538c

 source/Xcode-iOS/Test/Info.plist

@@ -11,7 +11,7 @@
   <key>CFBundleIconFile</key>
   <string></string>
   <key>CFBundleIdentifier</key>
   <string>com.yourcompany.${PRODUCT_NAME:identifier}</string>
   <string>com.yourcompany.${PRODUCT_NAME}</string>
   <key>CFBundleInfoDictionaryVersion</key>
   <string>6.0</string>
   <key>CFBundleName</key>