auto merge of #5329 : wanderview/rust/std-getopts-opts_present, r=graydon

Currently the opts_present() function only checks to see if the option is
configured in the match, but doesn't actually check to see if the option
value has been set.  This means that opt_present('h') may return false while
opts_present([~'h']) returns true.

Add a test case to catch this condition and fix opts_present() to check
the value before returning true.

Note, there is another API difference between these two functions that this
does not address.  Currently if you pass a non-configured option to
opt_present() the program will fail!(), but opts_present() simply returns
false.  If it is acceptable to standardize on the fail!() then opts_present()
should probably be implemented in terms of the opt_present() function.

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