Add x11 to pkg-config dep list on gdk-x11
Add x11 to pkg-config dep list on gdk-x11

Bug #613525.

jessevdk/vte,asivokon/vte-fx,thestinger/vte-ng,flaxandteal/gasket-vte,jessevdk/vte,gloob/vte-copy,rvu95/vte,saitoha/vte-sixel,rvu95/vte,gloob/vte-copy,thestinger/vte-ng,aligo/vte,rvu95/vte,gloob/vte-copy,rvu95/vte,aligo/vte,asivokon/vte-fx,asivokon/vte-fx,saitoha/vte-sixel,pjm0616/vte,jessevdk/vte,jessevdk/vte,thestinger/vte-ng,saitoha/vte-sixel,pjm0616/vte,pjm0616/vte,flaxandteal/gasket-vte,flaxandteal/gasket-vte,flaxandteal/gasket-vte,aligo/vte,asivokon/vte-fx