Add libclang-rt-dev to ubuntu-rolling

Debian/Ubuntu have changed their packaging such that libclang-dev no
longer includes libclang-rt-dev. We require the libraries in
libclang-rt-dev to run some of our tests.

Signed-off-by: Tristan Partin <tristan@partin.io>
Part-of: https://github.com/mesonbuild/meson/pull/16165
Closes: https://github.com/mesonbuild/meson/pull/16165
Signed-off-by: Sam James <sam@gentoo.org>

ci/ciimage/ubuntu-rolling/install.sh

@@ -17,7 +17,7 @@ pkgs=(
   llvm lcov
   dub ldc
   mingw-w64 mingw-w64-tools libz-mingw-w64-dev
-  libclang-dev
+  libclang-dev libclang-rt-dev
   libgcrypt20-dev
   libgpgme-dev
   libhdf5-dev