Prepare for elfutils 0.170

[Jose E. Marchesi]

        > It has been 3 months again so time for another update.
        > I just pushed the version bump update and would like to do a release
        > tomorrow unless some showstoppers are found.
        
        I tested current git master on Debian 8 amd64, Debian 9 amd64, Fedora
        rawhide x86_64, ppc64le, aarch64, ppc64, i686, s390x, armv7hl, RHEL6
        ppc, s390, x86_64, ppc64, i686, s390x and RHEL7 ppc, x86_64, s390,
        aarch64, ppc64le, ppc64, i686, s390x all with zero FAIL.
    
    Tried to build latest master in sparc64:
    
    ../../src/readelf.c:3805:7: error: ‘DWARF_ALL_KNOWN_DW_DEFAULTED’
     undeclared (first use in this function); did you mean ‘DWARF_ALL_KNOWN_DW_ATE’?
    
    Seems like a typo in readelf.c:dwarf_defaulted_string:
    
    #define DWARF_ONE_KNOWN_DW_DEFAULTED(NAME, CODE) [CODE] = #NAME,
          DWARF_ALL_KNOWN_DW_DEFAULTED
    #undef DWARF_ONE_KNOWN_DW_DEFAULTED


Never mind...  now that I bothered to actually read what that code does,
found the problem was I didnt configure enabling maintainer mode...

Maybe it would be good to update libdw/known-dwarf.h in the git repo...

PS: all 172 tests passed in sparc64-linux-gnu