Add unwind info to __libc_start_main so that unwinding continues one
extra level to _start. Similarly add unwind info to backtrace.
Given many targets require this, do this in a general way.
* csu/Makefile: Add -funwind-tables to libc-start.c.
* debug/Makefile: Add -funwind-tables to backtrace.c.
* sysdeps/aarch64/Makefile: Remove CFLAGS-backtrace.c.
* sysdeps/arm/Makefile: Likewise.
* sysdeps/i386/Makefile: Likewise.
* sysdeps/m68k/Makefile: Likewise.
* sysdeps/mips/Makefile: Likewise.
* sysdeps/nios2/Makefile: Likewise.
* sysdeps/sh/Makefile: Likewise.
* sysdeps/sparc/Makefile: Likewise.
2001-12-12 NIIBE Yutaka <gniibe@m17n.org>
* sysdeps/sh/Makefile: New file.
* sysdeps/sh/_mcount.S: New file.
* sysdeps/sh/sysdep.h (CALL_MCOUNT): Implemented.
* sysdeps/sh/machine-gmon.h: Remove "NOTYET" comment, as we are ready.