* man pages are only build/installed if WITH_MANPAGES is enabled
* create a new cmake function install_freerdp_man to unified install man
pages
* install all man pages using the new function
* update the nightly packages accordingly
* fix spelling errors
* move man page from section 1 to section 7
* fix the man page header to match the actual section
* adapt the packages for wlog.7
Fixes#3632
Recent cmake versions (starting with 3.0) don't use multiarch
libdir when the install prefix is not /usr. To have the same library
directory for all packages explicitly set CMAKE_INSTALL_LIBDIR to lib.