Add libquadmath - and use it in gfortran (round FIVE)

[Tobias Burnus <burnus at net-b dot de>]

This patch is based on the round FOUR patch at 
http://gcc.gnu.org/ml/gcc-patches/2010-11/msg01058.html

It consists of:
- The attached patch
- The attached changelog
- The library (unchanged): 
http://gcc.gnu.org/ml/gcc-patches/2010-11/msg00790/libquadmath.tar.bz2
- The test case at http://gcc.gnu.org/ml/gcc-patches/2010-11/txt00070.txt

For convenience - due to popular request-, I include again the generated 
files as additional attachment.

Changes:

a) Changes for configure and friends based on Ralf's review at 
http://gcc.gnu.org/ml/gcc-patches/2010-11/msg01332.html

b) gcc/testsuite/lib/gfortran.exp: Change handling of libgfortran.spec 
in testsuite/lib/gfortran.exp. That should fix the problem reported by 
Steve at http://gcc.gnu.org/ml/gcc-patches/2010-11/msg01339.html

I have successfully bootstrapped and regtested (check-gfortran and 
libgomp check) the patch on x86-64-linux. The previous patch has been 
tested on x86-64-Darwin (by Jack), on Cygwin (--disable-shared, by 
Angelo) and on x86-64 and i686 FreeBSD (by Steve).

OK for the trunk?

Tobias

Attachment: quad.diff.bz2
Description: application/bzip

Attachment: quad-gen.diff.bz2
Description: application/bzip

Attachment: ChangeLog.quad
Description: Text document