[patch, Fortran] Fix PR 120139, missing asterisk on prototype with -fc-prototypes

[Thomas Koenig]

Hello world,

this fixes the other regression which crept in with gfortran.
Again, regression-tested, plus the local testing script is
attached.

Ok for trunk and gcc-15?

Best regards

	Thomas

Fix explicit arrays with non-constant size for -fc-prototypes.

gcc/fortran/ChangeLog:

	PR fortran/120139
	* dump-parse-tree.cc (get_c_type_name): If no constant
	size of an array exists, output an asterisk.
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