Include libc++ statically in aprotoc.
Include libc++ statically in aprotoc.

Allows us to include aprotoc as a prebuilt separate from the platform
build for use in unbundled projects.

Bug: 19285118
Change-Id: I05f5dbf019ab08db31c33e7d30899189175a8315

geekboxzone/mmallow_external_protobuf,MonkeyZZZZ/platform_external_protobuf,MonkeyZZZZ/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,MonkeyZZZZ/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,MonkeyZZZZ/platform_external_protobuf,MonkeyZZZZ/platform_external_protobuf,geekboxzone/mmallow_external_protobuf,geekboxzone/mmallow_external_protobuf