DT_RELCOUNT changes

[Ulrich Drepper]

I've checked some changes in which take advantage of Jakub's combreloc
change.  I've tested it a bit on x86 and all works fine.  But nothing
else is tested yet.  I'll do Alpha and IA-64 tomorrow.

This all is complicated by the fact that I made a few more
enhancements.  I tried to be careful and hope all is well.  But every
port maintainer should check it.

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