Set py-limited-api dynamically

setup.cfg

@@ -6,8 +6,5 @@ project_urls =
     Source=https://github.com/Legrandin/pycryptodome/
     Changelog=https://www.pycryptodome.org/src/changelog
 
-[bdist_wheel]
-py-limited-api = cp36
-
 [build_sphinx]
 source-dir = Doc

setup.py

@@ -497,6 +497,13 @@ def create_cryptodome_lib():
 
 version_string = ".".join([str(x) for x in version_tuple])
 
+# Set the minimum ABI3 version for bdist_wheel to 3.6
+# unless Python is running without GIL (as there is no established way yet to
+# specify multiple ABI levels)
+setup_options = {}
+if 't' not in getattr(sys, 'abiflags', ''):
+    setup_options['options'] = {'bdist_wheel': {'py_limited_api': 'cp36'}}
+
 setup(
     name=project_name,
     version=version_string,
@@ -538,4 +545,5 @@ def create_cryptodome_lib():
         'test': TestCommand,
         },
     ext_modules=ext_modules,
+    **setup_options
 )