[PATCH] Fortran: different character lengths in array constructor [PR93289]

[Harald Anlauf]

Dear all,

the attached patch downgrades different constant character lengths in an
array constructor from a GNU to a legacy extension, so that users get a
warning with -std=gnu.  We continue to generate an error when standard
conformance is requested.

Regtested on x86_64-pc-linux-gnu (found one testcase where this
triggered... :)

OK for mainline?

Thanks,
Harald

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