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

[Dominique Dhumieres]

I have a few questions:

(1) Is sqrtl the only missing Fortran intrinsic?
(2) Is there a list of missing intrinsics and platforms?
(3) Does it make any sense to support REAL(10) if sqrtl 
is missing?

Cheers,

Dominique