Update git submodules

* Update build/make from branch 'master'
  to 45819baa42ee1af7570c1a49e0c67f6f1336bd37
  - Merge "Remove '=' from the valid module/stem names"
  - Remove '=' from the valid module/stem names
    
    Kati produces errors when a variable containing '=' is used as a
    dependency:
    
    google/kati#138
    
    So provide a better error message instead.
    
    Test: Add a module with an '=', see new error
    Change-Id: I09d570a8d19abb067621af9983a9d568b643dfb0