Also disable C and C++ specific warnings in thirdparty code
Also disable C and C++ specific warnings in thirdparty code

Move the `Append` up to make sure that the keys exist and avoid the
need to check `if CPPFLAGS in self`, etc.

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