Set LOCAL_EXPORT_C_INCLUDE_DIRS in Android.mk.

Export the lib/ directory to increase compatibility with
third-party code that includes <expat.h>.

(Android.mk currently copies expat.h and expat_external.h to
/usr/include/libexpat, but this location is non-standard.)

Bug: 22328216

(cherry picked from commit e665ddbe2535c55032569b0c41e9d728bef1f65b)

Change-Id: I734b2ee3ad3402b43ec44d6dd0f38aca5041ea21
1 file changed