Add an option to setup.py to skip building kitten

Fixes #6809

setup.py

@@ -145,6 +145,7 @@ class Options:
     prefix: str = './linux-package'
     dir_for_static_binaries: str = 'build/static'
     skip_code_generation: bool = False
+    skip_building_kitten: bool = False
     clean_for_cross_compile: bool = False
     python_compiler_flags: str = ''
     python_linker_flags: str = ''
@@ -959,6 +960,9 @@ def build_static_kittens(
     args: Options, launcher_dir: str, destination_dir: str = '', for_freeze: bool = False,
     for_platform: Optional[Tuple[str, str]] = None
 ) -> str:
+    if args.skip_building_kitten:
+        print('Skipping building of the kitten binary because of a command line option. Build is incomplete', file=sys.stderr)
+        return
     sys.stdout.flush()
     sys.stderr.flush()
     go = shutil.which('go')
@@ -1653,6 +1657,12 @@ def option_parser() -> argparse.ArgumentParser:  # {{{
         help='Do not create the *_generated.* source files. This is useful if they'
         ' have already been generated by a previous build, for example during a two-stage cross compilation.'
     )
+    p.add_argument(
+        '--skip-building-kitten',
+        default=Options.skip_building_kitten,
+        action='store_true',
+        help='Do not build the kitten binary. Useful if you want to build it separately.'
+    )
     p.add_argument(
         '--clean-for-cross-compile',
         default=Options.clean_for_cross_compile,