Add snapshot dir and script to build VNDK snapshot

The build script, build.sh, invokes the 'vndk' phony make target
to generate VNDK snapshots for all four archs arm, arm64, x86,
x86_64.

Test: development/vndk/snapshot/build.sh
Bug: 66059995
Change-Id: I0a48bb88bafc5e4a015f1016afcd55f616ab02e2
1 file changed