Remove hunks that accidentially ended up in Clang-libcpp patch.

Change-Id: Ib592d8498cabdafda0dc65cf81de4721f139ffc8
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
Add patch for newer XCode/clang versions on Mac.

Remove -Wno-deprecated-register from common.gypi.
This warning is not supported by recent clang versions
shipping with XCode. Therefore replacing it with -Wno-deprecated.
This is a bit a too broad fix, but the best we can do for now.
It seems that the flag is still supported in upstream clang.

Change-Id: I609355484c9b3ae111591a17181f02104bed6b6b
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>