add feature to strip "# comment" lines from prebuilt files

Change things so that when $(LOCAL_PREBUILT_STRIP_COMMENTS) is
nonempty, we copy the source file using sed to strip out all the "#
line"-style comments and blank lines, saving considerable system image
space in the case of some wifi configurations.

Bug: 2036961
2 files changed
tree: 95f4e7b76f9e905883c5434d0183bd876c899154
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh