graphics/rawtherapee: update to 5.11

and limit the "GCC 12" pinning to FreeBSD 14.0 (or in fact, 14 before
the next OSVERSION before 2023-11-19) because libcxx has been fixed
to build with GCC 13 and newer on 13.3 and 14.1, as seen in
PR: 273682
and the "GCC 12" pin can be removed on 2024-10-01.

This also adds autoreconf and libtool to the build requisites because
RawTherapee's build runs both to configure the embedded new LibRaw
0.21.0.Beta1 (shipped as part of RawTherapee).

ChangeLog: https://raw.githubusercontent.com/Beep6581/RawTherapee/5.11/RELEASE_NOTES.txt