emxomfld can generate incorrect stack size

[Steven Levine]

Given -Zlinker /ST:0x80000 emxomfld will generate OPTION STACK 0x80c00. The occurs because stack_size is signed and gcc implements the divide in

stack_size = (stack_size + 0xfff) / 1024;

at line 2135 as a signed shift with additional rounding. The generated code is effectively

stack_size = ((stack_size + 0xfff) + 0x3ff) >> 10;

[bird]

No, I think it's because my rounding is wrong. The statement should've read:

stack_size = (stack_size + 1023) / 1024;

or

stack_size = (stack_size + 0xfff) / 0x1000;

[bird]

(In [3731]) emxomfld.c: Fixed rounding bug when converting /STACK:xxx (link386/ilink) to wlink. References #239.

[bird]

(In [3732]) 0.6: Backported r3731: emxomfld.c: Fixed rounding bug when converting /STACK:xxx (link386/ilink) to wlink. Fixes #239.