* fold-const.c: Include "system.h" to get stdlib.h and stdio.h.
        (lshift_double): Add parentheses around + or - inside shift.
        (rshift_double): Likewise.
        (size_int_wide): Explicitly set type of `bit_p' to `int'.
        * Makefile.in (fold-const.o): Depend on system.h.

From-SVN: r18057