Put no-build-isolation into pip build cmd

Author: matthew-brett

config.sh

@@ -1,8 +1,9 @@
 # Define custom utilities
 # Test for OSX with [ -n "$IS_MACOS" ]
 
-function pip_opts {
-    echo "--no-build-isolation"
+function pip_wheel_cmd {
+    local abs_wheelhouse=$1
+    pip wheel $(pip_opts) -w $abs_wheelhouse --no-build-isolation --no-deps .
 }
 
 function run_tests {