Add entry points. Clean build dir

If build dir is not cleaned, then building for multiple different
Pythons will include extensions compiled for one Python version in the
wheels for another version, which conda does not like one bit
(among other reasons not to do it):

pypa/wheel#147

Add `--no-deps` to pip command. It doesn't seem to be necessary, as I
don't see dependencies being installed at build time. However it is
recommended so I'm doing it just in case.

setuptools_conda/setuptools_conda.py

@@ -275,6 +275,7 @@ def finalize_options(self):
     def run(self):
         # Clean
         shutil.rmtree(self.BUILD_DIR, ignore_errors=True)
+        shutil.rmtree('build', ignore_errors=True)
         os.makedirs(self.RECIPE_DIR)
 
         # Run bdist_wheel to make a wheel in the recipe dir:
@@ -297,7 +298,7 @@ def run(self):
             'package': {'name': self.NAME, 'version': self.VERSION,},
             'source': {'url': f'../{wheel}', 'sha256': sha256},
             'build': {
-                'script': "{{ PYTHON }} -m pip install %s -vv" % wheel,
+                'script': "{{ PYTHON }} -m pip install %s --no-deps -vv" % wheel,
                 'number': self.build_number,
             },
             'requirements': {
@@ -316,6 +317,10 @@ def run(self):
             package_details['build']['noarch'] = 'python'
         if self.build_string is not None:
             package_details['build']['string'] = self.build_string
+        console_scripts = self.distribution.entry_points.get('console_scripts', [])
+        gui_scripts = self.distribution.entry_points.get('gui_scripts', [])
+        if console_scripts or gui_scripts:
+            package_details['build']['entry_points'] = console_scripts + gui_scripts
         if self.license_file is not None:
             shutil.copy(self.license_file, self.BUILD_DIR)
             package_details['about']['license_file'] = f'../{self.license_file}'