Squashed 'waflib/' changes from 982416b8..6e726eb1
Squashed 'waflib/' changes from 982416b8..6e726eb1

6e726eb1 Add support for suppressing warnings from system libraries
3e43d096 Add short forms for common options
5db477ce Automatically define version for child libraries

git-subtree-dir: waflib
git-subtree-split: 6e726eb11d3e21be410549d27dd1aa94678f3d09

drobilla/ingen,drobilla/ingen,drobilla/ingen,drobilla/ingen