Libtoolize.cmake: fix broken create_libtool_file() macro
The .la files are installed in hardcoded at location at: ${CMAKE_INSTALL_PREFIX}/lib
This is completely wrong on most distros - especially 64 bit, where libraries are placed at /lib64 or /usr/lib64.
Fixing to use ${CMAKE_INSTALL_LIBDIR}, so the files are placed into the library directory given by the packager / operator.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net