linux arm64 support

[asa]

Describe the Bug
I tried to build on ubuntu 22 lts on arm64 architecture. There was an issue building an interface element which required moc. The moc bundled with webots in bin/qt/moc appears to be an x86 executable. I removed this dir and installed moc from qt6, but was unable to complete building the repo. Please advise what we might need to get in place in order to support a different architecture.

Steps to Reproduce
1, download webots on an arm64 linux host.
2) attempt to build using make -jN

Expected behavior
The project should build and launch on this architecture.

Screenshots
truncated output is like:

# compiling wren/WbWrenRangeQuantization.cpp
# compiling wren/WbWrenShaders.cpp
# compiling wren/WbWrenSmaa.cpp
# compiling nodes/utils/WbWrenVertexArrayFrameListener.cpp
# compiling vrml/WbWriter.cpp
make[1]: *** No rule to make target 'build/release/WbAboutBox.moc.cpp', needed by 'WbAboutBox.moc.o'.  Stop.
make[1]: *** Waiting for unfinished jobs....
# compiling core/WbPosixMemoryMappedFile.cpp
make: *** [Makefile:112: webots_target] Error 2

System
linux ubuntu 22, aarm64
Linux hostname 5.15.0-69-generic #76-Ubuntu SMP Fri Mar 17 17:25:19 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux

Additional context
Add any other context about the problem here.

[omichel]

Compiling Webots on Linux/arm64 is not officially supported. It is not supposed to work out-of-box. We never tried it. However, it should be possible with some adjustments, e.g., if you take care of using only arm64 libraries. Webots compiles on macOS/arm64, so I guess there is no major roadblock for getting it compiling on Linux/arm64.