conntrack-tools: bump to version 1.4.5

conntrack-tools: bump to version 1.4.5

Drop the musl workaround. musl can handle the suppression of conflicting
kernel headers definitions.

Add license file hash.

This bump fixes compatibility with newer versions of
libnetfilter_conntrack.

Fixes:
http://autobuild.buildroot.net/results/0ae/0aee137c9977e0fb33e7e557b75481780b90edcc/
http://autobuild.buildroot.net/results/9c1/9c178ec5ad84224a385c3184f09ea9b65867a302/
http://autobuild.buildroot.net/results/5e1/5e1ea89e01a9cc13bd384c97903e1726df6d2228/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>