cleanup some undesired library dependencies.


git-svn-id: http://root.cern.ch/svn/root/trunk@42549 27541ba8-7e3a-0410-8455-c3a389f83636

These are the changes needed to support explicitlink option for Linux and Mac.


git-svn-id: http://root.cern.ch/svn/root/trunk@41479 27541ba8-7e3a-0410-8455-c3a389f83636

Introduce alternative cmake based build system. Cmake is especially convenient
for building on Windows, as it can produce VC projects or nmake files and 
does not require cygwin to be installed. In addition on OSX Xcode projects
can be generated.


git-svn-id: http://root.cern.ch/svn/root/trunk@39463 27541ba8-7e3a-0410-8455-c3a389f83636