Log Message:
geography/gpsd: Work around three scons problems

Upstream's scons builds and links during the install phase, and
previously we did not pass MAKE_ENV in the install phase.

The other bug is that pkgsrc doesn't have scons support, so this is
all ad hoc.

The final bug is scons, which has not yet risen to reinvent autoconf.

(Probably this fixes RELRO.)