Using LDFLAGS ought to work, but libtool strips it out when compiling,
so it doesn't. Instead, set the CC variable so that it is always used.
This fixes the dependency on the libgcc DLL on Windows.
We already target the OS X 10.7 API, and 10.7 won't run on machines
that don't have a 64-bit-capable processor. So there's no reason not
to do this now.
By default we build the stable variant but provide a user-editable
list of packages which will be built at the latest variant instead.
Rename chocolate-doom-git package to chocolate-doom and have it use
the latest variant for the current Git build.
