Deal with Qt's CMake code modifying CMAKE_SHARED_LIBRARY_SUFFIX

Qt adds the Android ABI to the suffix there unconditionally, without also
adjusting CMAKE_FIND_LIBRARY_SUFFIXES accordingly, breaking find_library()
for things built that way. Unfortunately we can't just set this in our
toolchain file, as CMAKE_FIND_LIBRARY_SUFFIXES is overwritten by CMake
after evaluating the toolchain file. So we need to use the variable_watch
hack for this here, thanks to Aleix for the idea.

With this, find_library() works for both suffixed and un-suffixed libraries
again, such as Poppler built with or without Qt support.

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