[Hexagon] Add default clang symlinks to CLANG_LINKS_TO_CREATE (#123011)
Since this cache value overrides the defaults, we end up with `clang`
linked to `clang-20`, and some `${triple}-clang*` links, but we're
missing `clang++`. This makes for a toolchain with inconsistent behavior
when used in someone's `$PATH`.
We'll add the default symlinks to our list so that C and C++ programs
are both built as expected when `clang` and `clang++` are invoked.
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