Actions which have outputs used implicitly by other targets do not work 
correctly with Incredibuild (intermittently).

Apparently IB assumes that it can alter the order of custom build steps 
which have outputs used as inputs to other targets. This is not true for 
custom build rules.

As a work around, we can switch such actions to rules, but we should just 
do this automatically under the covers.

Also we might want to communicate with Xoreax on this.

This for example regularly plagued installer_util_strings.