Propagate sanitize.never flag in SDK snapshots.

This is necessary to not get dependencies on libclang_rt sanitizer libs
for the CRT objects which lead to cyclic dependencies in sanitizer
builds.

Test: `lunch aosp_blueline_hwasan-userdebug && m nothing`
  in a tree that has the prebuilts created and unzipped from
  `build/soong/scripts/build-aml-prebuilts.sh runtime-module-{sdk,host-exports}`
Bug: 151303681
Change-Id: I3f848a084280bdc3ade4b74df03e981d8cc61222