10dfec3bb6
This also cleans up a bunch of things on the way: -when perl was queried for paths they were not converted to CMake style on Windows. -the result when perl was queried for the perl library name was ignored since it was expanded with the possible paths, which is not a valid input for find_library(). If perl returns a library name we now will look only for this name and not for the default names and use the default names only when the executable does not give us a hint. -get rid of 2 variables that were only used at one place and directly put the values in the call to find_library() and find_path(). Inspired by Jeff Trull
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