Implemented the most minimal crt0 for Darwin (x86-64).
Implemented the most minimal crt0 for Darwin (x86-64).

dryc/libc11,dryproject/libc11,dryc/libc11,ZakharBondia/libc11,dryproject/libc11,dryproject/libc11,ZakharBondia/libc11,ZakharBondia/libc11,dryc/libc11