[v3] random.h doxygen fixes, stdc++.h update and use

[Benjamin Kosnik]

Removes \( markup from bits/random.h, as it seems to confuse
doxygen->latex and kills make doc-html-doxygen.

Updated doxygen docs have been uploaded to gcc.gnu.org.

The second patch updates the precompiled header with more C++0x
includes, and then substitutes a C++0x pch instead of the debug one.
This gives me speed increase around 20% when running the testsuite. 

tested x86_64/linux

-benjamin
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