[gfortran, patch] PR libfortran/21950

[FX Coudert]

Attached patch provides a fallback implementation of scalbn for 
platforms that don't have it. It allows gfortran to run on Tru64 UNIX 
V4.0F, IRIX 5.3 and 6.5.10 (without this patch, libgfortran builds but 
gfortran is not usable, since scalbn can't be resolved at linking).

Successfully built on 3 said platforms (see 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21950 for test results), and 
built and regtested on i686-linux.

I'm not sure whether it can be considered obvious, but I hope to have a 
quick approval since this actually allows gfortran to work on 3 more 
platforms.

OK for mainline and 4.0? (and should I wait for 4.0 to reopen or can I 
commit this now, trying to make it for 4.0.1?)

FX
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