[gfortran,patch] Removing runtime checking for MIN/MAX optional arguments

[François-Xavier Coudert]

:ADDPATCH fortran:

My previous patch to MIN/MAX added runtime checking of optional
arguments, checking that the first two arguments were present.
Unfortunately, the simplification routines can move arguments, making
us emit runtime errors on valid code (PR33095). This patch removes the
runtime error checking (and related testcases), as no other compiler
actually does it.

Regtested on x86_64-linux, OK to commit?

FX
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