* Makefile.in: Add many missing dependencies.
        * buffer.c, class.c, constants.c, decl.c: Use system.h and toplev.h
        as appropriate.
        * except.c, expr.c, jcf-io.c jcf-parse.c, jcf-write.c: Likewise.
        * jvgenmain.c lang.c mangle.c typeck.c verify.c: Likewise.

From-SVN: r22410