Changes are mostly bug fixes.
Perform conservative update: recreate libF77 and libI77 providing
binary compatibility.
Prefer files to patches creating respective files.
Override build system completely, we effectively did that anyway.
This addresses a temp file symlink race vulnerability. The f2c patch
is adapted from the debian one. The f2c-f77 (wrapper script which emulates
a fortran compiler) patch was done a bit differently.