cmMakefile: Refactor parameter and variable names for EnableLanguage

In commit 731369ef9c (ENH: try to initialize all languages at the same
time, 2004-08-27, v2.4.0~2899) the languages parameter name for
cmMakefile::EnableLanguage() was changed to "std::vector languages" in
the declaration, however the definition had "std::vector lang".

Furthermore, the variable names in the definition had confusing names,
such as the "i" variable in the loop which referred to an iterator at
one point, but no longer does.
1 file changed