Warning fixes:

Warning fixes:
        * Makefile.in (c-lang.o): Depend on output.h.
        * c-lang.c: Include output.h.
        * sparc.c (sparc_builtin_saveregs): Remove unused variable `fntype'.
        * except.c (expand_builtin_eh_stub): Likewise for variable `jump_to'.
        * genrecog.c (write_subroutine): When writing insn-recog.c, mark
        variables `insn', `pnum_clobbers', `x[0 .. max_depth]' and `tem'
        with ATTRIBUTE_UNUSED.
        * regmove.c (copy_src_to_dest): Make function static to match its
        prototype.
        * reload1.c Include hard-reg-set.h before rtl.h to get macro
        HARD_CONST.  Include machmode.h before hard-reg-set.h.
        * rtl.h: Prototype `retry_global_alloc' and wrap with macro
        HARD_CONST to protect usage of typedef HARD_REG_SET.
        * tree.c: Prototype `_obstack_allocated_p'.
        * varasm.c: Wrap prototype of `asm_output_aligned_bss' in macro
        BSS_SECTION_ASM_OP.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@20556 138bc75d-0d04-0410-961f-82ee72b054a4