[evolution-patches] [Mailer] Fix for Bug #325210 [sa-junk-plugin]

["shi pu sun com" <Shi Pu Sun COM>]

hey,

	Evolution-plugins junk learn can not work with SpamAssassin3.0 because
the sync option of "sa-learn" needed after SpamAssassin3.0 is "--sync"
and "--no-sync", but evolution-plugins assumes that junk learning works
based on SpamAssassin 2.x, whose sync option of sa-learn is "--rebuild"
and "--no-rebuild". 

        so i did the patch to resolve this problem. it analysize the
output of "sa-learn --version", and get the main version No.. 
	Anyone who could do me a favor to review it for me?

regards,

jerry