fix(jsii-dotnet-runtime): Build projects, not solutions.

The build script for jsii-dotnet-runtime built the solution, which would include the integration tests now that they are
added to the solution. The script now only builds the runtime (and implicitly its dependencies).

packages/jsii-dotnet-runtime/build.sh

@@ -11,6 +11,10 @@ rsync -av node_modules/jsii-runtime/webpack/ ${bundle_dir}
 # up an old build from the cache if it exists. So we
 # explicitly clear the cache as a temporary workaround.
 dotnet nuget locals all --clear
-dotnet build -c Release ./src/Amazon.JSII.Runtime.sln
+
+# Build just Runtime and it's dependencies instead of the
+# solution to avoid integration tests from trying to be
+# built before the calc packages are generated.
+dotnet build -c Release ./src/Amazon.JSII.Runtime
 
 cp -f ./bin/Release/NuGet/*.nupkg .