Update compiling_for_linuxbsd.rst

Added a description that compiling for RISC-V devices requires the use of the Clang compiler

(cherry picked from commit bd86d782325599f55664ad3c60319f7725d18203)

contributing/development/compiling/compiling_for_linuxbsd.rst

@@ -265,6 +265,7 @@ Manager.
 
     Using Clang appears to be a requirement for OpenBSD, otherwise fonts
     would not build.
+    For RISC-V architecture devices, use the Clang compiler instead of the GCC compiler.
 
 .. note:: If you are compiling Godot for production use, then you can
           make the final executable smaller and faster by adding the