- Explicitly list Qt core components in dependencies
Because GitHub releases (tarballs) are not fetched with correct modification
time, set TIMESTAMP to 1475427605 which corresponds to commit 7f9ae7c tagged
as this release.
Reported by: portscout
- Allow to build against Qt 5 instead of Qt 4 (off by default)
- Add missing `desktop-file-utils' to USES as suggested by `stage-qa'
- Remove INSTALLS_ICONS knob (not to be used for Qt-based programs)
- Fix a typo and rephrase pkg-message text while I am at it