Add LOCAL_SRCJARS to clear_vars.mk

I064889c9063b642835d9f668e2568b61d0fabe35 added LOCAL_SRCJARS but
forgot to clear it in clear_vars.mk.

Test: m checkbuild
Change-Id: I7d4e6a3821db0eccb25042091aa599cab381a1b0
1 file changed