sysutils/freefilesync: Update to 9.8

Port changes:

• Updated LICENSE_FILE
• Added IGNORE_FreeBSD_10 because of missing _cxa_thread_atexit()
• Added to LIB_DEPENDS
• Added USE_GNOME
• Removed USE_LDCONFIG
• Updated post-patch

PR: 226276
Submitted by: Olexandr Davydenko <odavydenko@gmail.com>
Approved by: tcberner (mentor, implicit)