Defining CERES_FOUND in addition to Ceres_FOUND in CeresConfig.

- Previously we relied on FindPackage() to define Ceres_FOUND when
  find_package(Ceres) was called.
- This is fine, but users might legitimately expect the variable to be
  CERES_FOUND given the form of CERES_INCLUDE_DIRS/LIBRARIES.
- As there is an inconsistency in the CMake recommended names when
  FindPackage() is called in Module vs Config form, we now explicltly
  define both.

Change-Id: I54bce9aa112b684d26b60a9ae4d11eb7925a6ee5
1 file changed