Collect generated rbc files under one folder

Mk2rbc takes a .mk file and produces a .rbc file under the
same path, but with a different stem. For example:
build/test/foo.mk becomes out/build/test/foo.rbc

This makes it difficult to see everything that mk2rbc has
generated in the out folder. Move the generated files to
out/rbc instead, so they have a common stem that is separate
from the rest of the build outputs.

Fixes: 202249430
Test: m RBC_PRODUCT_CONFIG=1 nothing
Change-Id: If3edba3feef9c2d3631244d533b997ef0b8b4e8b
diff --git a/scripts/rbc-run b/scripts/rbc-run
index ecc6edd..235da75 100755
--- a/scripts/rbc-run
+++ b/scripts/rbc-run
@@ -8,9 +8,9 @@
 declare -r output_root="${OUT_DIR:-out}"
 declare -r runner="${output_root}/soong/rbcrun"
 declare -r converter="${output_root}/soong/mk2rbc"
-declare -r launcher="${output_root}/launchers/run.rbc"
+declare -r launcher="${output_root}/rbc/launcher.rbc"
 declare -r makefile="$1"
 shift
-"${converter}" -mode=write -r --outdir "${output_root}" --launcher="${launcher}" "${makefile}"
+"${converter}" -mode=write -r --outdir "${output_root}/rbc" --launcher="${launcher}" "${makefile}"
 "${runner}" RBC_OUT="make,global" RBC_DEBUG="${RBC_DEBUG:-}" $@ "${launcher}"