[Patch,committed,Fortran] Disable complex checks in gfortran.dg/quad_1.f90

[Tobias Burnus]

The quad_1.f90 checks test the highest available floating point type. 
This works with libquadmath but it fails on systems with REAL(16) 
matching "long double" if the system's libm does not implement the C99 
complex math functions.

The simple solution is to disable those functions, which I did now.

Committed as Rev. 167455

Tobias
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