Merged revision(s) 84426-85443 from trunk/boost/interprocess. Merged revision(s) 84426-85443 from trunk/libs/interprocess. First Interprocess merge for 1.55


[SVN r85444]
Merged Interprocess to the release branch


[SVN r85615]
Merging latest spin_wait improvements + unused typedef removal.


[SVN r85653]
Last merge for 1.55 (Interprocess)

[SVN r85705]
Don't use EAGAIN as it's not used and requires missing cerrno

[SVN r86089]
Fixed typo in release notes for 1.55

[SVN r86181]
Fixed typo in release notes for 1.55 (again)

[SVN r86182]