MFH: r514253

www/wpebackend-fdo needs C++11 compiler:
/wrkdirs/usr/ports/www/wpebackend-fdo/work/wpebackend-fdo-1.4.0/src/ipc.h:40: error: ISO C++ forbids declaration of 'unique_ptr' with no type

sysutils/xfce4-kbdleds-plugin needs C11 compiler similarly to other xfce ports.

This MFH should unblock 265 ports.

Approved by: portmgr (tier-2 blanket)