Drop gcc-fortran from makedepends.

loqsrequested to merge
loqs/superlu:makedepends-drop-gcc-fortran into main

Fortran is used when superlu builds its vendored copy of blas. The PKGBUILD disables the building of superlu's vendored blas using the cmake option enable_internal_blaslib:BOOL=OFF so gcc-fortran is not used.

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