Extract PREBUILT_SDK_VERSION from the make build system and pass it to soong when doing ndk builds. Test: untested Change-Id: I573900dfb83aa8665c2bc349b7823e64497754d3
Test: OUT_DIR=ndk-out DIST_DIR=ndk-dist \ ./build/soong/scripts/build-ndk-prebuilts.sh Bug: None Change-Id: I3c930d2ec4d73196e355b90766eb14f0f0361460