Try to do without the lzma headers

I cannot figure out why the copy_directory command works locally,
but not on jenkins and errors out:

Error copying directory from "C:/Packaging/KritaDepsBuild/ext_lzma/ext_lzma-prefix/src/ext_lzma/include/lzma" to "C:/Packaging/KritaWS/deps-install//include/lzma".