Re-export exported includes from whole_static_libs

whole_static_libs is used to reexport all the symbols from a static
library when encapsulating it into another static library or shared
library, so reexport the headers as well.

Removes the need for libcxx to explicitly export the headers from
libcxxabi.

Change-Id: I283e043f2d2e819e2fdfa43b3f0f7a4537ba79ff
1 file changed