[PATCH] Don't run vrp87.c on various targets

[Dominique Dhumieres]

Jeff,

The tests fail also on powerpc*-*-* (see
http://gcc.gnu.org/ml/gcc-testresults/2013-04/msg01162.html and
http://gcc.gnu.org/ml/gcc-testresults/2013-04/msg01330.html ).
Could you please add it to the long list of skipped targets?

TIA

Dominique