This suite isn't referenced from anywhere yet, but it'll be included in
a standard ODASA dist because the dist includes all files in the `c` and
`cpp` directories. We can modify the nightly test jobs to include the
experimental suite.
In theory this query will produce no results on C++ code; in practice, I
suspect the "cpp" suite is often run on code compiled as C, so it is
likely to be worth running anyways.
As the queries live here, it makes sense for the suites to be versioned
together with them. The LGTM suite has already been moved. This commit
moves the actively-maintained non-LGTM suites.
This follows what's been done for JavaScript. The `cpp-alerts-lgtm`
suite is now empty and will be auto-generated when building a dist.
This commit has no effect in itself, but these files need to be in place
when the corresponding changes are made in Semmle/code.
