[Patch,build] PR 46540 - add --disable-libquadmath/--disable-libquadmath-support

[Tobias Burnus]

This patch adds two configure options:

--disable-libquadmath
     which disables the libquadmath build (e.g. to use the system's 
libquadmath)

--disable-libquadmath-support
     which disables the __float128/libquadmath support in gcc/fortran 
and in libgfortran

I did some initial tests with the patch; I will do some more regtests.

OK for committal?

Tobias

PS: I will document the options in install.html after committal.
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