IP: Fix build error on UWP
IP: Fix build error on UWP

Fixes this error:
```
drivers\unix\ip_unix.cpp(155): error C2593: 'operator =' is ambiguous
.\core/ustring.h(177): note: could be 'void String::operator =(const CharType *)'
.\core/ustring.h(176): note: or       'void String::operator =(const char *)'
drivers\unix\ip_unix.cpp(155): note: while trying to match the argument list '(String, int)'
```

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