Drop hard python-dev requirement

Change-Id: I820cddcb9c644bf21dca20566b406b52e277743d
diff --git a/bindep.txt b/bindep.txt
index efd3a10..7d34939 100644
--- a/bindep.txt
+++ b/bindep.txt
@@ -5,7 +5,6 @@
 libffi-devel [platform:rpm]
 gcc [platform:rpm]
 gcc [platform:dpkg]
-python-dev [platform:dpkg]
 python-devel [platform:rpm]
 python3-dev [platform:dpkg]
 python3-devel [platform:rpm]