Makefile: Remove config.status and common.env during 'make distclean' config.status and tests/qemu-iotests/common.env are generated files that should be deleted during 'make distclean'. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>