Fix header only cc_library for bindgen

rust_bindgen() in newer versions of rules_rust no longer accepts header
only cc_library() for the `cc_lib` field. The solution now is to add a
placeholder source file to all existing header libraries that are
passed to rust_bindgen().

Bug: 325494729
Change-Id: I6d06c14bb234b847590e2cc4de25d92fb262bad4
4 files changed
tree: 295459a93b6c903538037b37cae79cfca0666e4f
  1. gbl/
  2. libxbc/
  3. vts/
  4. .gitignore
  5. BUILD
  6. OWNERS