devel/include-what-you-use: update to version 0.7

• now uses clang 3.9 instead of clang 3.7
• add mappings for Qt 5.4
• premilinary mapings for libc++
• bugfix in fix_incudes.py
• various other fixes and enhancements
• add pkg-plist

PR: 215211
Submitted by: rene
Approved by: maintainer timeout (koobs, 16 days)