[Patch, Build, libquadmath] PR 47182 Fix BUGURL in libquadmath.texi

[Tobias Burnus]

The patch fixes setting the bugurl in libquadmath. The code mimics the 
one in in gcc/{configure.ac,Makefile.in,doc/include/gcc-common.texi} 
(the latter includes the generated gcc-vers.texi).

Build and regtested on x86-64-linux.
OK for the trunk?

Tobias
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