Add output file and dependencies to fontchain_lint

Keep fontchain_lint from rerunning on every make checkbuild by
making it touch an output file and giving it dependencies on
anything that should cause it to rerun.

Bug: 27727331
Test: m checkbuild
Change-Id: I0d8a41b308cac04844e27beb51c12dbf46cb1a4a
1 file changed