Attempt to fix macOS-on-silicon wheel building

The wheel produced for arm64 macs is b0rken, as if the shared object was
not properly linked against the static libpg_query.a library.

Try out suggestion found in
https://stackoverflow.com/questions/4597228/how-to-statically-link-a-library-when-compiling-a-python-module-extension,
where the static library if specified in extra_objects instead of a
normal library.

setup.py

@@ -7,6 +7,7 @@
 #
 
 from pathlib import Path
+import platform
 import subprocess
 import sys
 
@@ -38,6 +39,9 @@ def run(self):
         super().run()
 
 
+is_darwin_arm64 = sys.platform == 'darwin' and platform.mac_ver()[2] == 'arm64'
+
+
 setup(
     name="pglast",
     version=VERSION,
@@ -74,17 +78,20 @@ def run(self):
 
     cmdclass={'build_ext': BuildLibPgQueryFirst},
     ext_modules=[
-        Extension('pglast.parser',
-                  sources=['pglast/parser.c'],
-                  libraries=['pg_query'],
-                  include_dirs=list(
-                      map(str, (LIBPG_QUERY_DIR, VENDOR_DIR, INCLUDE_DIR)
-                          +
-                          ((INCLUDE_DIR / 'port' / 'win32',
-                            INCLUDE_DIR / 'port' / 'win32_msvc')
-                           if sys.platform == 'win32'
-                           else ()))),
-                  library_dirs=[str(LIBPG_QUERY_DIR)]),
+        Extension(
+            'pglast.parser',
+            sources=['pglast/parser.c'],
+            include_dirs=list(
+                map(str, (LIBPG_QUERY_DIR, VENDOR_DIR, INCLUDE_DIR)
+                    +
+                    ((INCLUDE_DIR / 'port' / 'win32',
+                      INCLUDE_DIR / 'port' / 'win32_msvc')
+                     if sys.platform == 'win32'
+                     else ()))),
+            extra_objects=[str(LIBPG_QUERY_DIR / 'libpg_query.a')] if is_darwin_arm64 else [],
+            libraries=['pg_query'],
+            library_dirs=[str(LIBPG_QUERY_DIR)]
+        ),
     ],
 
     install_requires=[