Use --all in some scripts. (#154)

This avoids the need to list all the packages in test-all.sh.

cranelift/format-all.sh

@@ -6,12 +6,8 @@
 set -e
 
 cd $(dirname "$0")
-src=$(pwd)
 
 # Make sure we can find rustfmt.
 export PATH="$PATH:$HOME/.cargo/bin"
 
-for crate in $(find "$src" -name Cargo.toml); do
-    cd $(dirname "$crate")
-    cargo fmt -- "$@"
-done
+exec cargo fmt --all -- "$@"