[build] Prepare Java.Runtime.Environment.Override.dllmap

Prepare dllmap override in Java.Interop repo to have
Java.Runtime.Environment.dll working with our libmono-android shared
library.

Introduced `build-tools/scripts/java-interop.dllmap` to share that
information between `Java.Interop.dll.config` and
`Java.Runtime.Environment.dll.config`.

Author: radekdoulik

Makefile

@@ -108,6 +108,7 @@ prepare-deps: prepare-external
 prepare-props: prepare-deps
 	cp build-tools/scripts/Configuration.Java.Interop.Override.props external/Java.Interop/Configuration.Override.props
 	cp $(call GetPath,MonoSource)/mcs/class/msfinal.pub .
+	cp build-tools/scripts/java-interop.dllmap external/Java.Interop/Java.Runtime.Environment.Override.dllmap
 
 prepare-msbuild: prepare-props
 ifeq ($(USE_MSBUILD),1)

build-tools/scripts/java-interop.dllmap

@@ -0,0 +1,4 @@
+  <dllmap dll="java-interop" os="osx" target="lib/host-Darwin/libmono-android.debug.dylib" />
+  <dllmap dll="java-interop" os="linux" target="lib/host-Linux/libmono-android.debug.so" />
+  <dllmap dll="java-interop" os="windows" wordsize="64" target="lib/host-mxe-Win64/libmono-android.debug.dll" />
+  <dllmap dll="java-interop" os="windows" wordsize="32" target="lib/host-mxe-Win32/libmono-android.debug.dll" />

external/Java.Interop

@@ -146,14 +146,15 @@
   <Target Name="_CreateJavaInteropDllConfig"
       Inputs="$(XAInstallPrefix)xbuild\Xamarin\Android\Java.Interop.dll"
       Outputs="$(XAInstallPrefix)xbuild\Xamarin\Android\Java.Interop.dll.config">
+    <ReadLinesFromFile
+	File="../../build-tools/scripts/java-interop.dllmap">
+	<Output
+	    TaskParameter="Lines"
+	    ItemName="_JavaInteropDllMapContent" />
+    </ReadLinesFromFile>
     <WriteLinesToFile
         File="$(XAInstallPrefix)xbuild\Xamarin\Android\Java.Interop.dll.config"
-        Lines="&lt;configuration&gt;
-  &lt;dllmap dll=&quot;java-interop&quot; os=&quot;osx&quot; target=&quot;lib/host-Darwin/libmono-android.debug.dylib&quot; /&gt;
-  &lt;dllmap dll=&quot;java-interop&quot; os=&quot;linux&quot; target=&quot;lib/host-Linux/libmono-android.debug.so&quot; /&gt;
-  &lt;dllmap dll=&quot;java-interop&quot; os=&quot;windows&quot; wordsize=&quot;64&quot; target=&quot;lib/host-mxe-Win64/libmono-android.debug.dll&quot; /&gt;
-  &lt;dllmap dll=&quot;java-interop&quot; os=&quot;windows&quot; wordsize=&quot;32&quot; target=&quot;lib/host-mxe-Win32/libmono-android.debug.dll&quot; /&gt;
-&lt;/configuration&gt;"
+        Lines="&lt;configuration&gt;;@(_JavaInteropDllMapContent);&lt;/configuration&gt;"
         Overwrite="True"
 	/>
     </Target>