gio/tests/file: skip the file monitor tests if using GPollFileMonitor
gio/tests/file: skip the file monitor tests if using GPollFileMonitor

test_create_delete() assumes that if it creates a file and then
immediately deletes it, that the file monitor will notice this and
record it as a create followed by a delete. But that won't work with
GPollFileMonitor, which will just think nothing changed. So skip the
test in that case.

https://bugzilla.gnome.org/show_bug.cgi?id=669331

johne53/MB3Glib,tamaskenez/glib,tamaskenez/glib,djdeath/glib,johne53/MB3Glib,MathieuDuponchelle/glib,djdeath/glib,mzabaluev/glib,djdeath/glib,Distrotech/glib,cosimoc/glib,tchakabam/glib,tamaskenez/glib,johne53/MB3Glib,cention-sany/glib,krichter722/glib,MathieuDuponchelle/glib,johne53/MB3Glib,johne53/MB3Glib,ieei/glib,endlessm/glib,krichter722/glib,lukasz-skalski/glib,djdeath/glib,djdeath/glib,ieei/glib,cention-sany/glib,mzabaluev/glib,gale320/glib,endlessm/glib,cention-sany/glib,lukasz-skalski/glib,gale320/glib,endlessm/glib,cention-sany/glib,tamaskenez/glib,cosimoc/glib,tamaskenez/glib,MathieuDuponchelle/glib,krichter722/glib,krichter722/glib,ieei/glib,cosimoc/glib,Distrotech/glib,cosimoc/glib,MathieuDuponchelle/glib,tchakabam/glib,tchakabam/glib,cention-sany/glib,mzabaluev/glib,tchakabam/glib,endlessm/glib,krichter722/glib,cosimoc/glib,gale320/glib,gale320/glib,Distrotech/glib,gale320/glib,tchakabam/glib,endlessm/glib,mzabaluev/glib,Distrotech/glib,Distrotech/glib,ieei/glib,lukasz-skalski/glib,ieei/glib,johne53/MB3Glib,lukasz-skalski/glib,mzabaluev/glib,MathieuDuponchelle/glib,lukasz-skalski/glib