Add support for the RISC-V architecture

Supports RV64GC (RISC-V 64-bit with general-purpose and compressed-instruction extensions)

modules/raycast/config.py

@@ -1,5 +1,7 @@
 def can_build(env, platform):
     # Depends on Embree library, which only supports x86_64 and aarch64.
+    if env["arch"].startswith("rv"):
+        return False
 
     if platform == "android":
         return env["android_arch"] in ["arm64v8", "x86_64"]