hdctools: build: fix library dependency to avoid rebuilds

The current rules with ftdicommon.o trigger the warning:
	make[1]: Circular ftdicommon.o <- Makefile dependency dropped.

This causes the local libraries to get linked twice -- once during
src_compile and again during src_install.  Tweak the dependency to
avoid the warning and the double linking.

BUG=None
TEST=`emerge hdctools` still works and doesn't re-compile/link when installing

Change-Id: I3ef2976a456c358fd5fe8c670927e2e4b78a209c
Reviewed-on: https://gerrit.chromium.org/gerrit/18288
Reviewed-by: Todd Broch <tbroch@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed