Fix ninja build on Android

platform_tools/android/bin/android_make

Index: platform_tools/android/bin/android_make
diff --git a/platform_tools/android/bin/android_make b/platform_tools/android/bin/android_make
index 46512bf8939e937f6979fc4a74581c275a95f09b..a5f5268931010c134cbf19a6fc15888ef2bb41ce 100755
--- a/platform_tools/android/bin/android_make
+++ b/platform_tools/android/bin/android_make
@@ -14,7 +14,7 @@ source $SCRIPT_DIR/android_setup.sh
 if [ $(basename $0) = "android_make" ]; then
     GYP_GENERATORS=make-android make ${APP_ARGS[@]}
 else
-    GYP_GENERATORS=ninja ./gyp_skia
+    GYP_GENERATORS=ninja-android ./gyp_skia
     OUT=$SKIA_OUT/${BUILDTYPE-Debug}   # Defaults to Debug if BUILDTYPE isn't set.
     ninja -C $OUT ${APP_ARGS[@]}
     ln -sf lib $OUT/lib.target         # android_run_skia looks in lib.target; ninja writes to lib.