collect2.c: Change DONT_DECLARE_SYS_SIGLIST to SYS_SIGLIST_DECLARED.

collect2.c: Change DONT_DECLARE_SYS_SIGLIST to SYS_SIGLIST_DECLARED.

        * collect2.c: Change DONT_DECLARE_SYS_SIGLIST to SYS_SIGLIST_DECLARED.
        * mips-tfile.c: Likewise.
        * gcc.texi: DONT_DECLARE_SYS_SIGLIST: Remove docs.
        * xm-linux.h (DONT_DECLARE_SYS_SIGLIST): Delete definition.
        * xm-freebsd.h, xm-bsd386.h, xm-sysv4.h, xm-sol2.h: Likewise.
        * configure.in: Check for sys_siglist declaration.
        * configure, config.in: Rebuilt.

Fix conflicting sys_siglist decls once and for all.

From-SVN: r15007