Match current Python version when searching for site-packages (scient…

…ific-python#29)

This allows side-by-side builds for multiple version of Python

devpy/cmds/util.py

@@ -36,9 +36,10 @@ def get_config():
 
 
 def get_site_packages(build_dir):
+    X, Y = sys.version_info.major, sys.version_info.minor
     for root, dirs, files in os.walk(install_dir(build_dir)):
         for subdir in dirs:
-            if subdir == "site-packages":
+            if subdir == "site-packages" and root.endswith(f"python{X}.{Y}"):
                 return os.path.abspath(os.path.join(root, subdir))