mingw libc: solve the segfault having to do with destructors

* fixed --verbose-cc printing an extra "zig" before the rest of
   the command line
 * windows-gnu targets use libfoo.a, foo.o extensions to match mingw
   conventions.
7b8ba871a9Andrew Kelley committed on 7/12/2019, 6:44:34 PMparentd9c4c96
4 files changedLine totals unavailable