PYTHON-2372 Build macOS releases in Evergreen (#486)

Author: ShaneHarvey

.evergreen/build-mac.sh

@@ -2,11 +2,14 @@
 
 for VERSION in 2.7 3.4 3.5 3.6 3.7 3.8; do
     if [[ $VERSION == "2.7" ]]; then
+        PYTHON=/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python
         rm -rf build
-        python$VERSION setup.py bdist_egg
+        $PYTHON setup.py bdist_egg
+    else
+        PYTHON=/Library/Frameworks/Python.framework/Versions/$VERSION/bin/python3
     fi
     rm -rf build
-    python$VERSION setup.py bdist_wheel
+    $PYTHON setup.py bdist_wheel
 done
 
 ls dist

.evergreen/config.yml

@@ -2581,7 +2581,7 @@ buildvariants:
 
 - matrix_name: "Release"
   matrix_spec:
-    platform: [ubuntu-20.04, windows-64-vsMulti-small]
+    platform: [ubuntu-20.04, windows-64-vsMulti-small, macos-1014]
   display_name: "Release ${platform}"
   tasks:
     - name: "release"