[patch, fortran] Fix PR41235, accepts invalid

[Daniel Franke]

Attached patch fixes PR41235, functions with non-constant string length as a 
return type require an explicit interface.

No new testcase as this is already included in gfortran.dg/auto_char_len_4.f90


2009-12-08  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/41235
	* interface.c (gfc_procedure_use): Check that character functions
	with non-constant length have an explicit interface. Merged if-branches.

2009-12-08  Daniel Franke  <franke.daniel@gmail.com>

	PR fortran/41235
	* gfortran.dg/auto_char_len_4.f90: Check for additional error.

Regression tested on i686-pc-linux-gnu. Ok for trunk?

Cheers

	Daniel
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