everyone else assumes that defining "_XOPEN_SOURCE" means XPG4.2,
so remove comparisions against the numerical values "3" or "4"

Add wordexp(3). The wordexp function performs shell-style word expansions.
This implementation is wrapper around the undocumented wordexp sh(1)
built-in command.

From FreeBSD.
Provided in PR lib/261

Add wordexp(3). The wordexp function performs shell-style word expansions.
This implementation is wrapper around the undocumented wordexp sh(1)
built-in command.

From FreeBSD.
Provided in PR lib/26123.
Approved by kleink@.

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