* harbour/bin/pack_src.sh
* try to detect GNU tar
* harbour/make_xmingw.sh
* added new default location for MinGW cross-compiler in Gentoo
distribution
* added auto detection of MinGW cross-compiler installation which
should work in most cases when default location test fails
* harbour/make_tgz.sh
* try to detect GNU make and GNU tar
* harbour/source/rtl/gtwvt/gtwvt.c
* call hb_gt_wvt_InitWindow explicitly to eliminate problems
with ignored WM_CREATE message when new window handler is not
yet registered
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