llvm: filter clang-ocl from the executables being probed (#47536)

This filters any selected executable ending with `-ocl` from the list of executables being probed as candidate for external `llvm` installations.

I couldn't reproduce the entire issue, but with a simple script:
```
#!/bin/bash

touch foo.o
echo "clang version 10.0.0-4ubuntu1 "
echo "Target: x86_64-pc-linux-gnu"
echo "Thread model: posix"
echo "InstalledDir: /usr/bin"
exit 0
```
I noticed the executable was still probed:
```
$ spack -d compiler find /tmp/ocl
[ ... ]
==> [2024-11-11-08:38:41.933618] '/tmp/ocl/bin/clang-ocl' '--version'
```
and `foo.o` was left in the working directory. With this change, instead the executable is filtered out of the list on which we run `--version`, so `clang-ocl --version` is not run by Spack.

0 files changed, 0 insertions, 0 deletions