Building latest LDC on windows

[Temtaime]

I figured out the bug.

test.d:
int foo() { asm { naked; xor EAX, EAX; ret; } }

ldc2 test.d -c

When looking obj file:
foo named as _D4test3fooFZi

If i remove "naked" then function named as __D4test3fooFZi that 
is correct.

I'll look at naked functions declaration.