* system.h: Include libiberty.h.
        * c-aux-info.c: Remove prototypes for concat/concat3.  Change
        function `concat' from fixed parameters to variable parameters,
        as is done in libiberty.  All callers of concat/concat3
        changed to use the new `concat' with variable args.
        * cccp.c: Remove things made redundant by libiberty.h and/or
        conform to libiberty standards.
        * cexp.y: Likewise.
        * collect2.c: Likewise.
        * config/1750a/1750a.h: Likewise.
        * cppalloc.c: Likewise.
        * cppexp.c: Likewise.
        * cppfiles.c: Likewise.
        * cpphash.c: Likewise.
        * cpplib.c: Likewise.
        * dyn-string.c: Likewise.
        * fix-header.c: Likewise.
        * gcc.c: Likewise.
        * gcov.c: Likewise.
        * genattr.c: Likewise.
        * genattrtab.c: Likewise.
        * gencheck.c: Likewise.
        * gencodes.c: Likewise.
        * genconfig.c: Likewise.
        * genemit.c: Likewise.
        * genextract.c: Likewise.
        * genflags.c: Likewise.
        * gengenrtl.c: Likewise.
        * genopinit.c: Likewise.
        * genoutput.c: Likewise.
        * genpeep.c: Likewise.
        * genrecog.c: Likewise.
        * getpwd.c: Likewise.
        * halfpic.c: Likewise.
        * hash.c: Likewise.
        * mips-tdump.c: Likewise.  Wrap malloc/realloc/calloc prototypes
        in NEED_DECLARATION_* macros.
        * mips-tfile.c: Remove things made redundant by libiberty.h and/or
        conform to libiberty standards.
        (fatal): Fix const-ification of variable `format' in
        !ANSI_PROTOTYPES case.
        * prefix.c: Remove things made redundant by libiberty.h and/or
        conform to libiberty standards.
        * print-rtl.c: Rename variable `spaces' to `xspaces' to avoid
        conflicting with function `spaces' from libiberty.
        * profile.c: Remove things made redundant by libiberty.h and/or
        conform to libiberty standards.
        * protoize.c: Likewise.
        * rtl.h: Likewise.
        * scan.h: Likewise.
        * tlink.c: Likewise.
        * toplev.c: Likewise.
        * toplev.h: Likewise.
        * tree.h: Likewise.

From-SVN: r23931