nodejs4, liblinebreak: use "Zlib" instead of "zlib" for LICENSE

* otherwise zlib license text provider isn't found:
  WARNING: The license listed zlib was not in the licenses collected for liblinebreak
  WARNING: liblinebreak: No generic license file exists for: zlib in any provider

[YOCTO #7584]

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>