fix(ci): handle --cppflags, --ldflags in pg_config stub

Author: dvarrazzo

scripts/build/pg_config_vcpkg_stub/pg_config_vcpkg_stub/__init__.py

@@ -44,6 +44,9 @@ def _main() -> None:
             raise ScriptError(f"libpq include directory not found: {d}")
         print(vcpkg_platform_root.joinpath("include"))
 
+    elif args.cppflags or args.ldflags:
+        print("")
+
     else:
         raise ScriptError("command not handled")
 
@@ -63,6 +66,16 @@ def parse_cmdline() -> Namespace:
         action="store_true",
         help="show location of C header files of the client interfaces",
     )
+    g.add_argument(
+        "--cppflags",
+        action="store_true",
+        help="(dummy) show CPPFLAGS value used when PostgreSQL was built",
+    )
+    g.add_argument(
+        "--ldflags",
+        action="store_true",
+        help="(dummy) show LDFLAGS value used when PostgreSQL was built",
+    )
     opt = parser.parse_args()
     return opt