[gfortran,patch] Add MIN/MAX for character type

[FX Coudert]

Hi all,

Attached patch adds support for MIN and MAX intrinsics on character- 
type expressions, which is part of F2003. It is rather  
straightforward, comes with a simplification routine and a library  
implementation. The most difficult part, in my opinion, is the trans- 
intrinsic.c part: since MIN/MAX accept a variable number of arguments  
(and they're the only intrinsics to do so), it requires special  
handling to create the library function call. I will also mention  
that the patch correctly takes into account the possibility of  
optional arguments.

Bootstrapped and regtested on x86_64-linux, comes with two testcases  
(one for valid code and one for runtime error checking). OK to commit?

FX


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