Patches for Portland Group (aka "pgi") compiler support

[Jeff Squyres]

(I figured I'd start this in a different thread so that it would be 
easy to find when searching; the patches are identical to what I 
submitted before, but in the interest of tying this all up in one 
thread...)

I've attached 2 patches to libtool.m4 -- one for branch-1-5 and one for 
branch-2-0 -- that add support for the Portland Group pgcc, pgCC, and 
pgf77 compilers to Libtool.  Both pass their respective test suites.  
The 2-0 patch ended its test suite with:

====================
All 115 tests passed
====================

(no tests were skipped or failed)

Thanks!

--
{+} Jeff Squyres
{+} address@hidden
{+} http://www.lam-mpi.org/

lt-1-5-pgi.patch
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lt-2-0-pgi.patch
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