In 0b0e661a85, we brought abseil back as a submodule, and we
added absl::headers as an interface library for importing
abseil headers' include directory. And:
```console
$ patchelf --print-rpath build/RelWithDebInfo/scylla
/home/kefu/dev/scylla/idl/absl::headers
```
In this change, we remove `absl::headers` from
`target_link_directories()` as it's an interface library that only
provides header files, not linkable libraries. This fixes the incorrect
inclusion of absl::headers in the rpath of the scylla executable.
Additionally, remove abseil library dependencies from the idl target
since none of the idl source files directly include abseil headers.
After this change,
```console
$ patchelf --print-rpath build/RelWithDebInfo/scylla
```
the output of `pathelf` is now empty.
Fixes#22265
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closesscylladb/scylladb#22266
fbca0a08f7