For all vndk snapshot libraries, header files exported by the libraries
will be included to the snapshot. Android.bp will contain necessary
information to link against/install vndk snapshot libraires:
export_include_dirs, export_system_include_dirs, export_flags, and
relative_install_path.
Bug: 132818174
Test: 1) VNDK_SNAPSHOT_BUILD_ARTIFACTS=true \
development/vndk/snapshot/build.sh
Test: 2) development/vndk/snasphot/update.py
Test: 3) see contents of Android.bp and include directories
Change-Id: I3ed179b613ca51f7854dc819783a962a56b973eb