* config/win/mingw.mk
* removed undocumented way (committed in prev rev) to disable
separate compile pass for mingw Harbour-*.dll. if you're bothered,
use existing and documented: HB_BUILD_DYN=no
; NOTE: separate compile pass has another important benefit:
it will finally remove the implicit .dll exports, IOW now
only explicitly exported symbols will be public, in sync
harbour-*.dlls created with all the other C compilers.
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