Chris Johns 96d55ab432 sb/pkgconfig: Cache pkgconfig based on a file name not name
- Caching on name falsely assumed checks across different config
  instances in nested build sets as used in vertical stack
  building was valid. This stopped a valid check for a prefix
  seeing if a valid BSP config was present.

Updates #3893
2020-03-03 11:18:05 +11:00
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