Fortran: fix checking of renamed-on-use interface name [PR120784]

	PR fortran/120784

gcc/fortran/ChangeLog:

	* interface.cc (gfc_match_end_interface): If a use-associated
	symbol is renamed, use the local_name for checking.

gcc/testsuite/ChangeLog:

	* gfortran.dg/interface_63.f90: New test.

(cherry picked from commit 6dd1659cf10a7ad51576f902ef3bc007db30c990)