sauerbraten FTBFS on kFreeBSD fixed in git

[Evgeni Golov <evgeni@debian.org>]

tag 621811 + patch
thanks

Hi,

there was a "trivial" mistake in the Makefile:
ifeq ($(PLATFORM),Linux)
CLIENT_LIBS+= -lrt
endif

I've added a
ifeq ($(PLATFORM),GNU/kFreeBSD)
CLIENT_LIBS+= -lrt
endif
below that and sauerbraten builds fine on io.debian.net now.
Yes, the not-striping of the ifeq is intentional, makes upstreaming the
patch easier and I have no clue about librt on Hurd.

The updated 30-fix-indirect-linking-for-binutils-gold.diff is in Git.

Have fun!
Evgeni