Disable GenerateRuntimeAnalyzersSWR in source build

Author: jjonescz

src/Installer/redist-installer/targets/GenerateMSIs.targets

@@ -420,7 +420,7 @@
 
   <Target Name="GenerateRuntimeAnalyzersNupkg"
           DependsOnTargets="GenerateLayout;MsiTargetsSetupInputOutputs"
-          Condition=" '$(OS)' == 'Windows_NT' And '$(Architecture)' == 'x64' "
+          Condition=" '$(OS)' == 'Windows_NT' And '$(Architecture)' == 'x64' And '$(DotNetBuildSourceOnly)' != 'true' "
           Inputs="$(RuntimeAnalyzersLayoutDirectory)/**/*;
                     $(SdkRuntimeAnalyzersNuspecFile);
                     $(GenerateNupkgPowershellScript)"