Gregory Nutt dd7c3bfa53 apps/testing/ostest: Add test for required argument format
The Linux man page requires that the getopt_long() and getopt_long_only() functions accept arguments to options in a form like:

    --option=argument

This PR adds a test that missing functionality that was recently added to NuttX.

This change also fixes an error in string comparison that was working before only because of the way that strings are stored by in linker ELF.  The address of the strings were being compared, not the value of the string.

This change effects only the getopt() tests of the OS test.

Tested on a simulator NSH configuration and used to verify the NuttX change.
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