Update ancillary mono ports
x11-toolkits/gnome-sharp20:
- update to version 2.24.4
- use github for sources
- use autoreconf and provided bootstrap script (pre-configure)
- remove gettext-runtime, not used by port
- order USES section, move non-USES related variables to own section
x11-toolkits/gtk-sharp20:
- update to version 2.12.45
- remove gettext-runtime, not used by port
- order USES section, move non-USES related variables to own section
Differential Revision: https://reviews.freebsd.org/D13751