[CMake] getting rid of additional quotes in generated vcproj PreprocessorDefines

[erwin at erwincoumans.com]

Is there a way to get rid of the additional &quot 

Given
ADD_DEFINITIONS(-DSN_TARGET_PS3) 

Then cmake autogenerates:
			PreprocessorDefinitions=","SN_TARGET_PS3"," 

I just want: 

	PreprocessorDefinitions="SN_TARGET_PS3" 


Is there a template that I can edit to solve this, or does it require C/C++ 
modifications? 

Thanks,
Erwin