build: When cross compiling, don't require host binaries if tests are not enabled
build: When cross compiling, don't require host binaries if tests are not enabled

These binaries are now only used by the test suite.  glib-genmarshal
*used* to be required to generate marshallers, but isn't anymore now
that we use libffi (via g_cclosure_marshal_generic).

https://bugzilla.gnome.org/show_bug.cgi?id=667806

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