yaml_cpp: Build for riscv64 (#10123)

Author: eschnett

Y/yaml_cpp/build_tarballs.jl

@@ -40,3 +40,5 @@ dependencies = Dependency[
 
 # Build the tarballs, and possibly a `build.jl` as well.
 build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; julia_compat="1.6", preferred_gcc_version=v"6")
+
+# Build trigger: 1