[gfortran,patch] temporary files directory

[FX Coudert]

Attached patch changes the default directory for temporary files from 
/var/tmp to /tmp since the former does not exist on all systems (mingw 
is an example). It enables libgfortran to look at the TEMP environment 
variable (in addition to TMP and GFORTRAN_TEMPDIR) when looking for the 
place to put its dirty temp files.

Built on i386-mingw32, testing under way on i686-linux. OK for mainline 
and 4.0?

FX
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