Patch to fix detection of {bits,ext}/atomicity.h with gcc >=4.2.0

[Tiziano Müller]

Hi there,

Since the bits/atomicity.h has been moved to ext/atomicity.h for gcc
>=4.2.0, a couple applications depending on commoncpp2 show build errors
>when building.
One part of the patch updates m4/ost_pthread.m4 to check for
ext/atomicity.h as well, the other part adds HAVE_EXT_ATOMICITY.H to
config.h.in and adds a define switch to include the right header-file.

I'd not hardcode either bits/atomicity.h or ext/atomicity.h depending on
the configure-results in the config.h since someone might build/have
built commoncpp with gcc-4.1.0 and then build the app with gcc-4.2.2
(or vice versa).

Cheers,
Tiziano

-- 
Tiziano Müller
Gentoo Linux Developer
Areas of responsibility: Samba, PostgreSQL, cpp, Python
E-Mail     : address@hidden
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1.6.1-gcc42_atomicity.patch
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