move zig.h to become an installation file

Now instead of zig.h being baked into the compiler binary, it is a
header file distributed along with all the other header files
distributed with Zig.

Closes #11643
0527b441aeAndrew Kelley committed on 7/27/2022, 5:26:45 PMparentc6f5832
4 files changedLine totals unavailable