patch: use _AC_LANG in messages for Fortran tests

[Steven G. Johnson]

I noticed that several of the output messages had "Checking for Fortran 
foo" instead of "Checking for _AC_LANG foo", where the latter gives a 
different message for Fortran and Fortran 77 tests.

2006-01-23  Steven G. Johnson  <address@hidden>

        * lib/autoconf/fortran.m4 (_AC_FC_LIBRARY_LDFLAGS,
        _AC_FC_DUMMY_MAIN, _AC_FC_MAIN, __AC_FC_NAME_MANGLING): Use
        _AC_LANG in check messages to differentiate Fortran and
        Fortran 77 tests.

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