Fix linker error

When compiling the examples that use the action client/server, you got
"undefined reference" errors for any `rcl_action_*` functions during the
linking phase. Telling rustc to link against the rcl_action shared
library fixes this.

Author: nwn

rclrs/build.rs

@@ -116,6 +116,7 @@ fn main() {
     }
 
     println!("cargo:rustc-link-lib=dylib=rcl");
+    println!("cargo:rustc-link-lib=dylib=rcl_action");
     println!("cargo:rustc-link-lib=dylib=rcl_yaml_param_parser");
     println!("cargo:rustc-link-lib=dylib=rcutils");
     println!("cargo:rustc-link-lib=dylib=rmw");