[Patch, Fortran, committed] Add libquadmath testcase gfortran.dg/quad_2.f90

[Eric Botcazou]

> The test uses the largest available floating-point number - be it 8, 10
> or 16 - and tests for that. The checks should be thus OK for any system.

It fails with a link failure on SPARC Solaris 8 and 9:

FAIL: gfortran.dg/quad_2.f90  -O0  (test for excess errors)
Excess errors:
Undefined                       first referenced
 symbol                             in file
sqrtl                               /var/tmp//ccU7N9qc.o
ld: fatal: Symbol referencing errors. No output written to ./quad_2.exe

-- 
Eric Botcazou