rsyslog: Update patch to upstreamed version

Patch for the libgcrypt-config path correction was accepted by the
mainline for rsyslog. Updating the buildroot patch until a new version
with the fix is released.

Signed-off-by: Clayton Shotwell <clshotwe@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>