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FindBZip2: Fix undefined variable BZIP2_LIBRARY

SHIHUANG QIN requested to merge QINSHIHUANG/cmake:fix-bzip2-target-property into master

In the FindBzip2.cmake file, the BZip2::BZip2 definition is assigned the IMPORTED_LOCATION property, as shown in the following code snippet, but the ${BZIP2_LIBRARY} variable is not defined, which will cause a linking error when compiling with BZip2::BZip2.

    if(NOT BZIP2_LIBRARY_RELEASE AND NOT BZIP2_LIBRARY_DEBUG)
      set_property(TARGET BZip2::BZip2 APPEND PROPERTY
        IMPORTED_LOCATION "${BZIP2_LIBRARY}")
    endif()

So I added a line to define BZIP2_LIBRARY.

set(BZIP2_LIBRARY ${BZIP2_LIBRARIES})

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