Remove a hack against CHOSEN_COMPILER_TYPE actually referring to a
different compiler (the system compiler), in particular leading to
a GCC vs clang confusion on FreeBSD 9. With FreeBSD 9 gone now,
this is no longer needed.

(A slightly different hack was in emulators/wine and got removed via
one of the "FreeBSD 9 gone" sweeps. With this commit, both ports are
now in sync again.)