cgal-toofile: move CGAL_ImageIO to cgalimageio toolfile

CGAL_ImageIO brings libSM.so* library from X11 into process.
Such library depends on libuuid on SLC6, but does not on SLC5.
libuuid on CMSSW_5_3_X slc5_amd64_gcc462 comes from e2fsprogs
package, which does not provide version symbols and thus is
not compatible with the one in SLC6 system.

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge pull request #233 from davidlt/53x-cgal-toolfile-CGAL_ImageIO

[CMSSW_5_3_X] CGAL toolfile split into two part (main without CGAL_ImageIO)