• Introduce MANPAGES option to control whether manual pages are built (make/leave it on by default)
• Remove DBUS_CMAKE_ON=-DWITH_DBUS=ON: it's already ON by default (set in awesomeConfig.cmake) so it's not needed and just raises questions
• DBUS_CMAKE_OFF: specify variable type (BOOL) as done everywhere else in the ports

Approved by: garga (maintainer)