The WIN32 CreateProcess() function does not require an .exe or .com
suffix in order to spawn an executable. Now that we have Cosmo bash
we're no longer so dependent on the cmd.exe prompt.
At least in neovim, `│vi:` is not recognized as a modeline because it
has no preceding whitespace. After fixing this, opening a file yields
an error because `net` is not an option. (`noet`, however, is.)
The intent with pledge("anet") has been to prevent outbound connections.
However we were only doing that for TCP sockets, and outbound UDP could
still get through, by using socket() plus sendto(). This change fixed
that by preventing UDP sockets from being created.
Credit goes to chc4 on Hacker News for finding this.
