Claudio Bley 5d10f7c5f1 [libpng15] Fixed CMakelists.txt to allow building a single variant of the ...

library (Claudio Bley):
  Introduced a PNG_LIB_TARGETS variable that lists all activated library
    targets.  It is an error if this variable ends up empty, ie. you have
    to build at least one library variant.
  Made the *_COPY targets only depend on library targets actually being build.
  Use PNG_LIB_TARGETS to unify a code path.

2013-03-07 11:01:35 -06:00

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