remove the fortran code from jrl-walkgen

src/Fortran/CMakeLists.txt

src/Fortran/dgesvd.f

src/Fortran/dgesvx.f

src/Fortran/dgetrf.f

src/Fortran/dgetrf2.f

src/Fortran/dlamch.f

src/Fortran/dlapy2.f

src/Fortran/gdgemm.f

src/Fortran/gdgges.f

src/Fortran/gdtgex2.f

src/Fortran/gdtgexc.f

src/Fortran/gdtgsen.f

src/Fortran/gsgemm.f