Set VSSDKTargetPlatformRegRootSuffix for Roslyn.csproj
Set VSSDKTargetPlatformRegRootSuffix for Roslyn.csproj

Fixes broken F5 experience with Roslyn.csproj set as the startup project.

dpoeschl/roslyn,heejaechang/roslyn,VSadov/roslyn,panopticoncentral/roslyn,stephentoub/roslyn,mgoertz-msft/roslyn,shyamnamboodiripad/roslyn,VSadov/roslyn,sharwell/roslyn,agocke/roslyn,MichalStrehovsky/roslyn,MichalStrehovsky/roslyn,heejaechang/roslyn,tmeschter/roslyn,KevinRansom/roslyn,reaction1989/roslyn,VSadov/roslyn,agocke/roslyn,jmarolf/roslyn,tannergooding/roslyn,cston/roslyn,DustinCampbell/roslyn,jasonmalinowski/roslyn,genlu/roslyn,jasonmalinowski/roslyn,mavasani/roslyn,weltkante/roslyn,sharwell/roslyn,dotnet/roslyn,jasonmalinowski/roslyn,jmarolf/roslyn,dpoeschl/roslyn,nguerrera/roslyn,gafter/roslyn,swaroop-sridhar/roslyn,shyamnamboodiripad/roslyn,genlu/roslyn,mavasani/roslyn,sharwell/roslyn,mgoertz-msft/roslyn,gafter/roslyn,swaroop-sridhar/roslyn,heejaechang/roslyn,weltkante/roslyn,bartdesmet/roslyn,tmat/roslyn,KevinRansom/roslyn,ErikSchierboom/roslyn,brettfo/roslyn,reaction1989/roslyn,mavasani/roslyn,dpoeschl/roslyn,aelij/roslyn,mgoertz-msft/roslyn,abock/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,AmadeusW/roslyn,brettfo/roslyn,KirillOsenkov/roslyn,DustinCampbell/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,davkean/roslyn,jcouv/roslyn,dotnet/roslyn,xasx/roslyn,stephentoub/roslyn,AmadeusW/roslyn,CyrusNajmabadi/roslyn,tannergooding/roslyn,tmat/roslyn,cston/roslyn,abock/roslyn,nguerrera/roslyn,reaction1989/roslyn,diryboy/roslyn,KevinRansom/roslyn,MichalStrehovsky/roslyn,nguerrera/roslyn,KirillOsenkov/roslyn,swaroop-sridhar/roslyn,AmadeusW/roslyn,xasx/roslyn,DustinCampbell/roslyn,wvdd007/roslyn,ErikSchierboom/roslyn,bartdesmet/roslyn,gafter/roslyn,aelij/roslyn,bartdesmet/roslyn,eriawan/roslyn,shyamnamboodiripad/roslyn,diryboy/roslyn,eriawan/roslyn,stephentoub/roslyn,xasx/roslyn,ErikSchierboom/roslyn,weltkante/roslyn,CyrusNajmabadi/roslyn,wvdd007/roslyn,wvdd007/roslyn,abock/roslyn,AlekseyTs/roslyn,physhi/roslyn,cston/roslyn,agocke/roslyn,jcouv/roslyn,AlekseyTs/roslyn,eriawan/roslyn,physhi/roslyn,physhi/roslyn,CyrusNajmabadi/roslyn,genlu/roslyn,jmarolf/roslyn,davkean/roslyn,tmeschter/roslyn,panopticoncentral/roslyn,tannergooding/roslyn,aelij/roslyn,brettfo/roslyn,dotnet/roslyn,KirillOsenkov/roslyn,panopticoncentral/roslyn,tmeschter/roslyn,diryboy/roslyn,tmat/roslyn,jcouv/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,davkean/roslyn,AlekseyTs/roslyn