Update (lib)expat to 2.2.4

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

Update (lib)expat to 2.2.3
Remove poor entropy hack, 2.2.3 uses /dev/urandom in worst case

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

Add the same workaround as for the expat package in toolchain.
I'm not really sure what made it work for me earlier but this seems to fix it.

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

Signed-off-by: Ted Hess <thess@kitschensync.net>

Update (lib)expat to 2.2.2

Fixes following CVEs: CVE-2017-9233 and CVE-2016-9063 (2.2.2)
Update homepage URL

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

Update libexpat to upstream release 2.2.0

Signed-off-by: Paul Wassi <p.wassi@gmx.at>

The .so symlinks (without any suffix) are only used by compiler/linker and
not needed on the target system.
See https://github.com/openwrt/packages/pull/274 for a short discussion.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

- fix licensing file list
- install pkgconfig file
- drop explicite call to Build/Compile
- use PKG_INSTALL

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

Signed-off-by: Steven Barth <steven@midlink.org>