Upgrade cmake to 3.16 for Darwin

Built at http://fusion-qa/2a43409b-4fa3-4de7-93f3-e63e0b5fbacd

One difference here is that ninja and android.toolchain.cmake are not
included.

Users should sync from prebuilts/ninja or external/android-cmake
directly.

Bug: 149782024
Change-Id: I999781a5641532e0c432ea28eccde23c0d7c063c
diff --git a/share/cmake-3.16/Help/prop_tgt/MACOSX_BUNDLE.rst b/share/cmake-3.16/Help/prop_tgt/MACOSX_BUNDLE.rst
new file mode 100644
index 0000000..92bce53
--- /dev/null
+++ b/share/cmake-3.16/Help/prop_tgt/MACOSX_BUNDLE.rst
@@ -0,0 +1,12 @@
+MACOSX_BUNDLE
+-------------
+
+Build an executable as an Application Bundle on macOS or iOS.
+
+When this property is set to ``TRUE`` the executable when built on macOS
+or iOS will be created as an application bundle.  This makes it
+a GUI executable that can be launched from the Finder.  See the
+:prop_tgt:`MACOSX_BUNDLE_INFO_PLIST` target property for information about
+creation of the ``Info.plist`` file for the application bundle.
+This property is initialized by the value of the variable
+:variable:`CMAKE_MACOSX_BUNDLE` if it is set when a target is created.