ConfigureChecks.cmake and Windows

[Brad King]

Alex,

In order to reliably test for symbols on all platforms including Windows 
one should use the check_symbol_exists macro because it accounts for 
symbols defined as macros or with non-C calling conventions.  I've 
attached a patch that converts some of the checks in 
ConfigureChecks.cmake and documents how to add more such checks.

The most important change in the patch right now is to use 
check_symbol_exists for vsnprintf in order to build on Visual Studio.

-Brad
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