maint: the compiler is not always named gcc
maint: the compiler is not always named gcc

https://bugzilla.redhat.com/show_bug.cgi?id=994589 complained that
even when using a cross-compiler not named 'gcc', the configure
output confusingly referred to gcc.

* m4/virt-compile-warnings.m4 (LIBVIRT_COMPILE_WARNINGS): Use a
more generic statement in configure output.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

fabianfreyer/libvirt,VenkatDatta/libvirt,elmarco/libvirt,fabianfreyer/libvirt,agx/libvirt,cbosdo/libvirt,rlaager/libvirt,shugaoye/libvirt,crobinso/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,zippy2/libvirt,jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,crobinso/libvirt,datto/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,zippy2/libvirt,shugaoye/libvirt,rlaager/libvirt,elmarco/libvirt,nertpinx/libvirt,libvirt/libvirt,nertpinx/libvirt,taget/libvirt,fabianfreyer/libvirt,elmarco/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,andreabolognani/libvirt,rlaager/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,cbosdo/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,eskultety/libvirt,rlaager/libvirt,nertpinx/libvirt,jfehlig/libvirt,datto/libvirt,cbosdo/libvirt,shugaoye/libvirt,taget/libvirt,libvirt/libvirt,eskultety/libvirt,elmarco/libvirt,jfehlig/libvirt,agx/libvirt,taget/libvirt,shugaoye/libvirt,crobinso/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,andreabolognani/libvirt,taget/libvirt,nertpinx/libvirt,jfehlig/libvirt,olafhering/libvirt,elmarco/libvirt,VenkatDatta/libvirt,datto/libvirt,zippy2/libvirt,nertpinx/libvirt,agx/libvirt,eskultety/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jardasgit/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,agx/libvirt,crobinso/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,datto/libvirt,agx/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,olafhering/libvirt