[RFC] Removing workarounds for pre-ISO C++ compilers

[Richard Guenther]

Would there be any objections to the removal of the workarounds for 
pre-ISO C++ compilers like

checking whether we have complete IO manipulators... yes
checking whether we have a standard iosbase class... yes
checking whether we have sstream... yes
checking whether we have a complex inside std... yes
checking whether we support dependent template arguments... yes
checking whether we support delete operators with placement argument... yes
checking whether we handle default args to template functions correct... yes
checking whether we have std::ios_base::fmtflags... yes
checking for support of templated friends... yes
checking numer of template arguments of std::ostream_iterator... 1
checking for std::min(), std::max()... yes
checking for standard conforming iterators... yes

Pretty much any up-to-date compiler handles these correctly today.  Also 
not all such uses are guarded by the workarounds and I lack a dumb 
enough compiler to check their correct usage.

Any thoughts?

Richard.