More MinGW build issues

[Michael Cronenworth]

Issue 1: commit 2e503dccd889a3f83951830fda18c9357377693d
    The added calls to getopt and friends require unistd.h be included for all 
builds. Patch attached.

Issue 2: commit 677dee1a04058aefe8c7689f88da52afe3b4b4bb
    With the switch around of all your source directories and addition of 
compiler defines for system paths this introduced a conflict with a Windows 
header. In common/path.c the shlobj.h header defines DATADIR.

Would you be open to renaming your local DATADIR define?

Regards,
Michael
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