Simpler setuptools_scm and setuptools_conda usage

Author: rpanderson

setup.cfg

@@ -44,5 +44,3 @@ console_scripts =
 
 [dist_conda]
 pythons = 3.6, 3.7, 3.8
-platforms = linux-64,win-32,win-64,osx-64
-force_conversion = True

setup.py

@@ -1,10 +1,9 @@
 import os
 from setuptools import setup
-from distutils import sysconfig
+from setuptools.dist import Distribution
 
 try:
     from setuptools_conda import dist_conda
-
     CMDCLASS = {"dist_conda": dist_conda}
 except ImportError:
     CMDCLASS = {}
@@ -20,17 +19,10 @@
     DATA_FILES = []
     PACKAGE_DATA = {"labscript_suite": [os.path.join("..", "labscript-suite.pth")]}
 
-VERSION_SCHEME = {}
-VERSION_SCHEME["version_scheme"] = os.environ.get(
-    "SCM_VERSION_SCHEME", "guess-next-dev"
-)
-VERSION_SCHEME["local_scheme"] = os.environ.get("SCM_LOCAL_SCHEME", "node-and-date")
-
-VERSION_SCHEME = {}
-VERSION_SCHEME["version_scheme"] = os.environ.get(
-    "SCM_VERSION_SCHEME", "release-branch-semver"
-)
-VERSION_SCHEME["local_scheme"] = os.environ.get("SCM_LOCAL_SCHEME", "node-and-date")
+VERSION_SCHEME = {
+    "version_scheme": os.getenv("SCM_VERSION_SCHEME", "guess-next-dev"),
+    "local_scheme": os.getenv("SCM_LOCAL_SCHEME", "node-and-date"),
+}
 
 setup(
     use_scm_version=VERSION_SCHEME,