tools: ratbactl.test: if RATBAGCTL_DEVEL is set, use the existing server
tools: ratbactl.test: if RATBAGCTL_DEVEL is set, use the existing server

When there's a bug that's triggered by the test suite it's hard to figure out
what exactly crashes. So allow starting ratbagd.devel manually and run the
test suite against that process so we can gdb it.

The steps required for this are a bit insane, so the instructions are listed.

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

libratbag/libratbag,libratbag/libratbag,whot/libratbag,whot/libratbag,libratbag/libratbag,whot/libratbag