chroot_version_hooks: clean up old glibc headers

Newer glibc versions have dropped some header files.  Make sure we
prune the headers from the older glibc so packages don't get confused.

BUG=chromium:834385
TEST=`run_chroot_version_hooks` pruned headers from my boards, but left installed rpc packages alone

Change-Id: I4ba89ed0530d03c613e895ff7bb52d0323cef329
Reviewed-on: https://chromium-review.googlesource.com/1335861
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed