Remove unused function.
Merge topic 'version-compare-genex' into next

91b4d01 Remove unused function.
De-duplicate version comparison code.

Extend the VersionCompare in cmSystemTools to handle 8 components,
and port the if command to use that.
Add generator expressions for version comparision.
Add generator expressions for compiler versions.

New generator expressions allow retrieval of the version per language,
as well as equality comparison.
Merge topic 'version-compare-genex' into next

e5df663 Add generator expressions for compiler versions.
e605528 Add generator expressions for version comparision.
48bb48e De-duplicate version comparison code.