Revert "remove obsolete? build-all target"

still need it for testing
This reverts commit 237d01df9e28c51bdccb3e1e123e3662d66dcdda.

bin/kaleidoscope-builder

@@ -507,6 +507,15 @@ find_all_sketches () {
     done | sort
 }
 
+build_all () {
+    plugins="$(find_all_sketches)"
+
+    for plugin in ${plugins}; do
+        export SKETCH="${plugin}"
+        $0 "${plugin}" build
+    done
+}
+
 
 size () {
     compile