Treat global variables differently

[MilkeeyCat]

If you try to put this

u8 AF_INET = 2;
u8 SOCK_DGRAM = 2;

in global scope and compile it will generate

.comm AF_INET 1
mov byte ptr [AF_INET], 2
.comm SOCK_DGRAM 1
mov byte ptr [SOCK_DGRAM], 2

which is fucking wrong, instead global variables should be treated differently and they should be allowed to have only compile time expression as initializer