tools: xxd-c: include getopt.h through <mk_getopt.h> for portability (#1026)
tools: xxd-c: include getopt.h through <mk_getopt.h> for portability (#1026)

I can confirm this patch fixes compile errors within tools/xxd-c.c,
and allows us to use xxd-c.exe on Windows.

    % .\bin\debug\xxd-c.exe -i test.conf
    ...
    static unsigned char __test_conf[] = {
        0x61, 0x69, 0x75, 0x65, 0x6f,
    };

Signed-off-by: Fujimoto Seiji <ef879192bb1e41d519c82cf76440dc8e9a530806@clear-code.com>
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