wmc: remove redeclaration of optarg and optind

[carlo.bramix at libero.it]

When compiling with CYGWIN, the compiler complains that 'optarg' and 'optind' 
are redeclared without dllimport in WMC and WRC tools.

In my opinion, it would be better to remove those redeclarations because 
actually "wine/port.h" already replaces their absence.

I tried to compile without those redeclaration on:
Ubuntu 12.04: no problems.
CYGWIN: no more complains about dllimport redeclaration.
MINGW: it provides an implementation of getopt functions in libmingwex, but 
they are bugged to me so I deleted getopt.h from the main includes for forcing 
the usage of the getopt functions provided directly by libwine. Also in this 
case, no problems found, even with a system without any builtin support of 
getopt.

Attached patches delete those redeclarations of 'optarg' and 'optind'.

Sincerely,

Carlo Bramini.
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