various nptl patches

[Timo Teräs]

Ok, second try on getting the libc - libpthread interactions right.

This includes the Joakim's patch for protected symbols, with a little
fix from me.

It also tries to fix up the nptl/linuxthreads mess in the include
files; so now you should get less warnings and more consistent
environment.

And I finally figured out how the interactions should go; so now
the weak/strong symbol stuff should be good too.

Please review, and consider applying.

Thanks!
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