/usr/share/mk/sys.mk and FORTRAN on -CURRENT

[Don Lewis]

I was taking a look at why math/lapack fails to build on -CURRENT and
discovered that the port uses ${FC} to find the FORTRAN compiler.  I
then discovered that /usr/share/mk/sys.mk defines ${FC} as f77 (or
fort77).  I don't this is appropriate since f77 has been removed from
-CURRENT.

I don't know what the proper fix is, but I though I should point out the
problem ...