build_packages: Don't transitively upgrade dev-lang/rust
Rust is getting upgraded in some builders because of transitive BDEPEND dependencies
causing build breakage. Exempt rust from building as a critical toolchain package
if a prebuilt is not available.
Commit-Queue: Manoj Gupta <firstname.lastname@example.org>
Tested-by: Manoj Gupta <email@example.com>
Reviewed-by: Wei-Cheng Xiao <firstname.lastname@example.org>
Reviewed-by: Mike Frysinger <email@example.com>
diff --git a/build_packages b/build_packages
index 6a9f5f9..dfda48d 100755
@@ -441,6 +441,7 @@
# to `emerge` below once we figure out how to exclude toolchain packages from
# being upgraded transitively via BDEPEND relations.