Ensure JI's jnienv-gen is built before Javan.Interop-MonoAndroid.csproj.

Author: jpobst

src/Mono.Android/Mono.Android.targets

@@ -32,6 +32,9 @@
         XAInstallPrefix=$(XAInstallPrefix);
       </_GlobalProperties>
     </PropertyGroup>
+    <MSBuild
+        Projects="$(JavaInteropFullPath)\build-tools\jnienv-gen\jnienv-gen.csproj"
+    />
     <MSBuild
         Projects="$(JavaInteropFullPath)\src\Java.Interop\Java.Interop-MonoAndroid.csproj"
         Properties="$(_GlobalProperties)"