glib-2.0: Fix GMarkupParser binding
glib-2.0: Fix GMarkupParser binding

As the GMarkupParser struct only stores function pointers and no
targets, no destroy function is necessary.

Fixes bug 595925.

GNOME/vala,Jc2k/vala,rvu95/vala,playya/vala,severinh/vala,flobrosch/vala-fixes,jessevdk/vala,severinh/vala,Distrotech/vala,frida/vala,frida/vala,themiwi/vala,themiwi/vala,themiwi/vala,Distrotech/vala,jessevdk/vala,playya/vala,GNOME/vala,flobrosch/vala-fixes,kamanashisroy/aroop,rvu95/vala,GNOME/vala,tjol/vala-tjol,phako/vala,kamanashisroy/aroop,Jc2k/vala,flobrosch/vala-fixes,GNOME/vala,tjol/vala-tjol,lovebug356/vala,rvu95/vala,severinh/vala,xdave/pvala,tjol/vala-tjol,kamanashisroy/aroop,lovebug356/vala,spidermonkdust/vala,jessevdk/vala,playya/vala,phako/vala,spidermonkdust/vala,spidermonkdust/vala,Distrotech/vala,frida/vala,frida/vala,frida/vala