Add info as to why the bit-width workaroudn will fail.
Make the Flagpoll section visually different.
Add the CMakePackageConfigHelpers.cmake file from CMake 2.8.10.

We use it only if we need to, but allows compatibility at least
back to 2.8.6. (Haven't tried it with earlier.)
The defines are _WIN32 and _WIN64
MSVC isn't the only windows compiler, but it is the only one that likes pragma warning( disable
Don't duplicate cmake's effort: use what it knows for the flagpoll file.

At worst, there will be extra warnings.
Remove trailing spaces
Configuring into the source tree is poor style - redirect to binary tree.
Combine all set_target_properties calls.
Merge branch '1.2-otherpatches' into 1.2-improvements