* harbour/config/win/watcom.cf
* added SYS NT to link options - it's default in Windows builds but
is necessary in cross builds
* harbour/config/global.cf
* small modification in platform checking order to reduce possible
interactions with some extended host information
+ added automatic HB_BIN_COMPILE setting based on binaries located
in PATH.
! export some variables to avoid repeated setting in recursive calls
what causes some bad side effects, i.e. multiple __PLATFORM__*
macro settings in cross builds what was breaking cross compilation
and also slow down the whole build process.
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