* docs/debugging.txt, gobject/glib-genmarshal.c,
gobject/glib-genmarshal.1, gobject/Makefile.am, gobject/gtype.c:
Remove references to gruntime. This includes renaming the test
program testgruntime to testgobject and the debug envvar
GRUNTIME_DEBUG to GOBJECT_DEBUG. (#50877)