Port r22681 to ACLiC: work around a problem building ROOT on windows: cygwin has its own  link.exe (as in hardlink) which clashes with MSVC's link.exe. With  this patch, link is called with its absolute path derived from cl.exe.
Port r22681 to ACLiC:
work around a problem building ROOT on windows: cygwin has its own 
link.exe (as in hardlink) which clashes with MSVC's link.exe. With 
this patch, link is called with its absolute path derived from cl.exe.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@22970 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root