GDScript: Fix analysis of singleton dependencies
GDScript: Fix analysis of singleton dependencies

Sometimes a singleton might depend on another before they are fully
compiled so we can't rely on globals in this case.

vkbsb/godot,Zylann/godot,firefly2442/godot,vkbsb/godot,pkowal1982/godot,godotengine/godot,sanikoyes/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,Zylann/godot,MarianoGnu/godot,Zylann/godot,honix/godot,Zylann/godot,honix/godot,firefly2442/godot,akien-mga/godot,firefly2442/godot,akien-mga/godot,Paulloz/godot,Zylann/godot,vkbsb/godot,Faless/godot,vkbsb/godot,Valentactive/godot,pkowal1982/godot,sanikoyes/godot,Paulloz/godot,akien-mga/godot,Faless/godot,Shockblast/godot,firefly2442/godot,Paulloz/godot,Faless/godot,Paulloz/godot,ZuBsPaCe/godot,godotengine/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,vnen/godot,Zylann/godot,vkbsb/godot,pkowal1982/godot,MarianoGnu/godot,Shockblast/godot,honix/godot,sanikoyes/godot,Shockblast/godot,firefly2442/godot,guilhermefelipecgs/godot,MarianoGnu/godot,godotengine/godot,sanikoyes/godot,Valentactive/godot,akien-mga/godot,ZuBsPaCe/godot,godotengine/godot,DmitriySalnikov/godot,sanikoyes/godot,vnen/godot,Faless/godot,honix/godot,DmitriySalnikov/godot,Valentactive/godot,honix/godot,BastiaanOlij/godot,vnen/godot,sanikoyes/godot,josempans/godot,vnen/godot,akien-mga/godot,josempans/godot,josempans/godot,MarianoGnu/godot,ZuBsPaCe/godot,Shockblast/godot,sanikoyes/godot,MarianoGnu/godot,vnen/godot,akien-mga/godot,honix/godot,MarianoGnu/godot,Paulloz/godot,vkbsb/godot,firefly2442/godot,sanikoyes/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,MarianoGnu/godot,Zylann/godot,Valentactive/godot,Valentactive/godot,firefly2442/godot,BastiaanOlij/godot,MarianoGnu/godot,ZuBsPaCe/godot,BastiaanOlij/godot,godotengine/godot,Faless/godot,godotengine/godot,akien-mga/godot,Zylann/godot,josempans/godot,vkbsb/godot,ZuBsPaCe/godot,vnen/godot,ZuBsPaCe/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,godotengine/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,Faless/godot,firefly2442/godot,godotengine/godot,Valentactive/godot,josempans/godot,Shockblast/godot,BastiaanOlij/godot,BastiaanOlij/godot,BastiaanOlij/godot,pkowal1982/godot,josempans/godot,Paulloz/godot,vnen/godot,Valentactive/godot,josempans/godot,guilhermefelipecgs/godot,Shockblast/godot,josempans/godot,Valentactive/godot,ZuBsPaCe/godot,pkowal1982/godot,Paulloz/godot,guilhermefelipecgs/godot,akien-mga/godot,DmitriySalnikov/godot,Shockblast/godot,vnen/godot,pkowal1982/godot,pkowal1982/godot,DmitriySalnikov/godot,Faless/godot,Shockblast/godot,ZuBsPaCe/godot,vkbsb/godot,pkowal1982/godot,Faless/godot