Fix String::itos/String::num_int64(INT64_MIN) output.
Fix String::itos/String::num_int64(INT64_MIN) output.

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