expat was fixed in regards to XML symbol visibility to fix
crashes in font-config.
- according to upstream changelog:
- Improved ability to build without the configure-generated
expat_config.h header. This is useful for applications
which embed Expat rather than linking in the library.
because I am not exactly sure about implication of this, rather use
-DXML_HAVE_VISIBILITY in CFLAG_VISIBILITY in expat-visibility.patch