build: Bump FreeRDP version to 2.3.x
Quoting the main commit here:
After a very long time, Fedora finally started shipping FreeRDP >=
2.3.x stable releases, which allow now to bump the version requirement.
So, do exactly that and get rid of all the HAVE_FREERDP_2_3 ifdefs.
There are also some very tiny fixes (mostly spelling fixes) in this branch.