CMake 2.8 RPM .spec for RHEL6

Courtesy of Jonathan G. Underwood:
http://jgu.fedorapeople.org/cmake28-2.8.8-4.el6.src.rpm
Remove mention of rcver as it confuses the download code
Backport GUI library dependencies to RHEL5

These originally came from the CMake 2.8.5 .spec in PUIAS.
Depend on newer (GCC 4.4) toolchain
Don't add GUI by default

Getting hold of Qt 4.6 on RHEL5 is not going to be easy, and it is
little likely that anyone uses those machines as a workstation anymore.
Use a patch instead of a second source

Thus, we only need to worry about getting *.patch to SOURCES/
Disable testing which is broken
Don't try to install GUI-specific files unless --with gui
Merge pull request #4 from rolk/004_cmake28

Spec file for CMake 2.8 for RHEL 5