[CMake] Checking MSVC90 or higher?

[Robert Dailey]

There is a specific compiler flag that I'm telling CMake to use for the MSVC
compiler, however this flag is only supported by MSVC90 and higher. Right
now I'm doing this:
if( MSVC90 )
...
endif()

But how do I check something like this:

if( MSVC_VERSION GREATER 9 OR MSVC_VERSION EQUAL 9 )
...
endif()

I realize MSVC_VERSION doesn't exist, but this is mainly pseudocode to show
you what I'm looking for. Help is appreciated.
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