Fix OCaml linker flag and align validation runners with build runners

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

.github/workflows/nightly.yml

@@ -77,7 +77,7 @@ jobs:
   validate-macos-headerpad-x64:
     name: "Validate macOS x64 dylib headerpad"
     needs: [mac-build-x64]
-    runs-on: macos-13
+    runs-on: macos-latest
     timeout-minutes: 15
     steps:
       - name: Checkout code

.github/workflows/release.yml

@@ -96,7 +96,7 @@ jobs:
   validate-macos-headerpad-x64:
     name: "Validate macOS x64 dylib headerpad"
     needs: [mac-build-x64]
-    runs-on: macos-13
+    runs-on: macos-15
     timeout-minutes: 15
     steps:
       - name: Checkout code

src/api/ml/CMakeLists.txt

@@ -160,7 +160,7 @@ endif()
 if( APPLE )
   # set(ocaml_rpath "@executable_path/../libz3${so_ext}")
   # Add headerpad for install_name_tool compatibility on macOS
-  list(APPEND c_lib_deps "-Wl,-headerpad_max_install_names")
+  list(APPEND c_lib_deps "-ldopt" "-Wl,-headerpad_max_install_names")
 elseif( UNIX )
   set(ocaml_rpath "\\$ORIGIN/../libz3${so_ext}")
   list(APPEND c_lib_deps "-dllpath" ${ocaml_rpath})