Cache .rustup regardless of whether there are cargo files or not.

Signed-off-by: David Calavera <david.calavera@gmail.com>

Author: calavera

run-build-functions.sh

@@ -689,10 +689,10 @@ cache_artifacts() {
   cache_home_directory ".boot" "boot dependencies"
   cache_home_directory ".composer" "composer dependencies"
   cache_home_directory ".homebrew-cache", "homebrew cache"
+  cache_home_directory ".rustup" "rust rustup cache"
 
   if [ -f Cargo.toml ] || [ -f Cargo.lock ]
   then
-    cache_home_directory ".rustup" "rust rustup cache"
     cache_home_directory ".cargo/registry" "rust cargo registry cache"
     cache_home_directory ".cargo/bin" "rust cargo bin cache"
   fi