Remove ABSL from clang

Author: mborland

.drone.jsonnet

@@ -419,7 +419,7 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
         "Linux 24.04 Clang 21",
         "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'clang', COMPILER: 'clang++-21', CXXSTD: '17,20,2b' },
-        "libabsl-dev", "clang-21",
+        "clang-21",
         ["deb http://apt.llvm.org/noble/ llvm-toolchain-noble-21 main"],
     ),