setup: Require setuptools and entry_points:

This gives us a consistent experience and a simpler setup across all
operating systems. Setuptools is available everywhere these days.

.appveyor.yml

@@ -108,7 +108,7 @@ install:
   - cmd: if %compiler%==msys2-mingw ( set "PATH=C:\msys64\mingw%PACMAN_BITS%\bin;%PATH%" )
   - cmd: if %compiler%==msys2-mingw ( set "MESON_PYTHON_PATH=C:\msys64\mingw%PACMAN_BITS%\bin" )
   - cmd: if %compiler%==msys2-mingw ( set "PYTHON=python3" )
-  - cmd: if %compiler%==msys2-mingw ( C:\msys64\usr\bin\pacman -S --needed --noconfirm "mingw%PACMAN_BITS%/mingw-w64-%PACMAN_ARCH%-python3" )
+  - cmd: if %compiler%==msys2-mingw ( C:\msys64\usr\bin\pacman -S --needed --noconfirm "mingw%PACMAN_BITS%/mingw-w64-%PACMAN_ARCH%-python3" "mingw%PACMAN_BITS%/mingw-w64-%PACMAN_ARCH%-python3-setuptools" )
   # Cygwin
   - cmd: if not %compiler%==cygwin ( set "PATH=%cd%;%MESON_PYTHON_PATH%;%PATH%;" )
   - cmd: if %compiler%==cygwin ( set WRAPPER=ci\run-in-cygwin.bat )

setup.py

@@ -14,7 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import sys
 
 from mesonbuild.coredata import version
@@ -24,44 +23,11 @@ if sys.version_info < (3, 5, 0):
           'Meson requires Python 3.5.0 or greater')
     sys.exit(1)
 
-# We need to support Python installations that have nothing but the basic
-# Python installation. Use setuptools when possible and fall back to
-# plain distutils when setuptools is not available.
-try:
-    from setuptools import setup
-    from setuptools.command.install_scripts import install_scripts as orig
-except ImportError:
-    from distutils.core import setup
-    from distutils.command.install_scripts import install_scripts as orig
+from setuptools import setup
 
-class install_scripts(orig):
-    def run(self):
-        if sys.platform == 'win32':
-            super().run()
-            return
-
-        if not self.skip_build:
-            self.run_command('build_scripts')
-        self.outfiles = []
-        if not self.dry_run:
-            self.mkpath(self.install_dir)
-
-        # We want the files to be installed without a suffix on Unix
-        for infile in self.get_inputs():
-            infile = os.path.basename(infile)
-            in_built = os.path.join(self.build_dir, infile)
-            in_stripped = infile[:-3] if infile.endswith('.py') else infile
-            outfile = os.path.join(self.install_dir, in_stripped)
-            # NOTE: Mode is preserved by default
-            self.copy_file(in_built, outfile)
-            self.outfiles.append(outfile)
-
-entries = {}
-if sys.platform == 'win32':
-    # This will create Scripts/meson.exe and Scripts/meson-script.py
-    # Can't use this on all platforms because distutils doesn't support
-    # entry_points in setup()
-    entries = {'console_scripts': ['meson=mesonbuild.mesonmain:main']}
+# On windows, will create Scripts/meson.exe and Scripts/meson-script.py
+# Other platforms will create bin/meson
+entries = {'console_scripts': ['meson=mesonbuild.mesonmain:main']}
 
 setup(name='meson',
       version=version,
@@ -78,8 +44,6 @@ setup(name='meson',
                 'mesonbuild.modules',
                 'mesonbuild.scripts',
                 'mesonbuild.wrap'],
-      scripts=['meson.py'],
-      cmdclass={'install_scripts': install_scripts},
       entry_points=entries,
       data_files=[('share/man/man1', ['man/meson.1']),
                   ('share/polkit-1/actions', ['data/com.mesonbuild.install.policy'])],