* system.h: Include stdarg.h/varargs.h, make sure they are ordered
        correctly with regards to stdio.h.
        * calls.c: Remove stdarg.h/varargs.h.
        * cccp.c: Likewise.
        * cexp.y: Likewise.
        * combine.c: Likewise.
        * cpperror.c: Likewise.
        * cpplib.c: Likewise.
        * cpplib.h: Likewise.
        * doprint.c: Likewise.
        * emit-rtl.c: Likewise.
        * final.c: Likewise.
        * fix-header.c: Likewise.
        * gcc.c: Likewise.
        * genattr.c: Likewise.
        * genattrtab.c: Likewise.
        * gencodes.c: Likewise.
        * genconfig.c: Likewise.
        * genemit.c: Likewise.
        * genextract.c: Likewise.
        * genflags.c: Likewise.
        * genopinit.c: Likewise.
        * genoutput.c: Likewise.
        * genpeep.c: Likewise.
        * genrecog.c: Likewise.
        * mips-tfile.c: Likewise.
        * prefix.c: Likewise.
        * protoize.c: Likewise.
        * regmove.c: Likewise.
        * toplev.c: Likewise.
        * tree.c: Likewise.
        * cp/errfn.c: Remove stdarg.h/varargs.h.
        * cp/tree.c: Likewise.

From-SVN: r21997