Philippe Canal c8eb357738 CompilerId: Tolerate variables named for languages ...

If a project or user sets a variable or cache entry named `C`, `CXX`,
`CUDA`, `Fortran`, `CSharp`, or `ISPC`, we were previously comparing
each enabled language name to the value of that variable, rather than
the name itself.  Double-quote the string to take advantage of policy
`CMP0054`, but also add "x" prefixes to support projects that do not set
the policy.

This extends a similar fix in commit bd16a985fc (CompilerId/Features:
Tolerate variables named for languages, 2021-04-28) in more places.  In
particular, ensure that we consider the proper list of compiler ids.

Issue: #22125

2021-06-18 09:41:08 -04:00

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