win32: minor improvements to process spawning

The function mingw_spawn_forkshell() was introduced to handle
spawning a forkshell process.  Since we know that:

- the binary being executed doesn't meet any of the special cases
  handled by spawnveq()
- the arguments don't require quoting

we can call spawnve() directly instead of spawnveq().

Also, use xzalloc() to allocate new_argv so we don't need to set
the final NULL pointer explicitly.

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