[fortran, patch] Remove libgfortranbegin.a

[FX]

Hi,

6 years ago, we removed the static helper library libgfortranbegin.a. Since gfortran 4.5, we don’t use it, but still provide it for backward compatibility.

I’m thinking 6 years notice is enough, and we should remove it. A search for it on github and other code repositories does not indicate any real use in existing build systems, but quite a few cases of people confused by its existence and purpose.

I’m saying we get rid of it. Attached patch bootstrapped and tested on x86_64-apple-darwin.
OK to commit?

FX

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