After JDK-8338304, we are seeing tool from Clang GCC installation is being picked up unexpectedly (JDK build configured with `--with-toolchain-type=clang`). In the specific case, user supplied compiler toolchain is used by setting `CXX=<user_specified_path_to_tools_script>` during configuration, for example. Apparently, `UTIL_REQUIRE_PROGS(LLD, lld)` is not able to resolve `lld` properly in this case.

```
Found candidate GCC installation: <snip>
Selected GCC installation: <snip>
...
clang: error: unsupported option '-V -static-libgcc'
configure:85215: $? = 1
configure:85204: <snip> -qversion >&5
clang: error: unknown argument '-qversion'; did you mean '--version'?
...
```

I've tested with a change to not do `UTIL_REQUIRE_PROGS(LLD, lld)` in the case where user specified toolchain should be used with more complex compilation environment. That reverts back to the previous behavior and works without issue for user specified toolchain usages.