Makefile: add "wheel" to pip install

This fixes the `make pyenv` step if python3-wheel package is not installed.

Makefile

@@ -97,7 +97,7 @@ proxy:
 pyenv${PYTHON_VERSION}:
 	virtualenv --python=/usr/bin/python${PYTHON_VERSION} pyenv${PYTHON_VERSION}
 	. pyenv${PYTHON_VERSION}/bin/activate && \
-		pip install autopep8 azdev azure-mgmt-loganalytics==0.2.0 ruamel.yaml && \
+		pip install autopep8 azdev azure-mgmt-loganalytics==0.2.0 ruamel.yaml wheel && \
 		azdev setup -r . && \
 		sed -i -e "s|^dev_sources = $(PWD)$$|dev_sources = $(PWD)/python|" ~/.azure/config