Bison: update to 2.7 with ictce-5.5.0
Flex: updated to 2.5.37 with ictce-5.5.0
libxc: update to 2.0.1 with ictce-5.5.0

CP2K needs version 2.0.1
FFTW: updated to 3.3.3 with ictce-5.5.0
CP2K: updated to version 20131205
CP2K: added version 2.4.0 with ictce-5.5.0
M4: remove old patch from 1.4.17
CP2K: small change to be compatible with bash 3.x
Update CP2K to 20131205 and delete 20131205

The bash fix has already been accepted upstream, so upgrade version to
that svn.
CP2k: fixed name of patch, should work now
CP2K: reworked after remarks.
M4: use GNU_SOURCE template in source url
CP2K: enable libxc support
CP2K: drop libxc options, use the dep

In the easyblock, we will check in the dependencies for libxc and libint
Bison: use GNU_SOURCE as source url
Merge pull request #601 from wpoely86/cp2k

Cp2k