- Replace WITHOUT_X11 with an X11 option.
- Remove USE_FORTRAN. It isn't required.
- Add a do-build target so we no longer have to build static libraries
- Remove patching of "CFLAGS=" into "CFLAGS+=", because with base system
make, += allows CFLAGS from /usr/share/mk or make.conf to slip in.
Instead pass CFLAGS via EXTRACFLAGS which is also used to control the
-fpic flag in do-build.