[Mono.Android] Build jnimarshalmethod-gen.exe

Build the tool to be used for generating the marshal methods, it will
be used when user enables it with the
`AndroidGenerateJniMarshalMethods` property.

Author: radekdoulik

Xamarin.Android.sln

@@ -41,6 +41,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tools", "Tools", "{864062D3
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "jcw-gen", "external\Java.Interop\tools\jcw-gen\jcw-gen.csproj", "{52C7D9B6-E8C8-47D0-9471-652D278D7D77}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "jnimarshalmethod-gen", "external\Java.Interop\tools\jnimarshalmethod-gen\Xamarin.Android.Tools.JniMarshalMethodGenerator.csproj", "{D1295A8F-4F42-461D-A046-564476C10002}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Java.Interop.Tools.JavaCallableWrappers", "external\Java.Interop\src\Java.Interop.Tools.JavaCallableWrappers\Java.Interop.Tools.JavaCallableWrappers.csproj", "{D18FCF91-8876-48A0-A693-2DC1E7D3D80A}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Xamarin.Android.Tools.ApiXmlAdjuster", "external\Java.Interop\src\Xamarin.Android.Tools.ApiXmlAdjuster\Xamarin.Android.Tools.ApiXmlAdjuster.csproj", "{1268EADF-8344-431C-81F6-FCB7CBC99F49}"
@@ -186,6 +188,10 @@ Global
 		{52C7D9B6-E8C8-47D0-9471-652D278D7D77}.Debug|AnyCPU.Build.0 = Debug|Any CPU
 		{52C7D9B6-E8C8-47D0-9471-652D278D7D77}.Release|AnyCPU.ActiveCfg = Release|Any CPU
 		{52C7D9B6-E8C8-47D0-9471-652D278D7D77}.Release|AnyCPU.Build.0 = Release|Any CPU
+		{D1295A8F-4F42-461D-A046-564476C10002}.Debug|AnyCPU.ActiveCfg = Debug|Any CPU
+		{D1295A8F-4F42-461D-A046-564476C10002}.Debug|AnyCPU.Build.0 = Debug|Any CPU
+		{D1295A8F-4F42-461D-A046-564476C10002}.Release|AnyCPU.ActiveCfg = Release|Any CPU
+		{D1295A8F-4F42-461D-A046-564476C10002}.Release|AnyCPU.Build.0 = Release|Any CPU
 		{D18FCF91-8876-48A0-A693-2DC1E7D3D80A}.Debug|AnyCPU.ActiveCfg = Debug|Any CPU
 		{D18FCF91-8876-48A0-A693-2DC1E7D3D80A}.Debug|AnyCPU.Build.0 = Debug|Any CPU
 		{D18FCF91-8876-48A0-A693-2DC1E7D3D80A}.Release|AnyCPU.ActiveCfg = Release|Any CPU
@@ -367,6 +373,7 @@ Global
 		{3F1F2F50-AF1A-4A5A-BEDB-193372F068D7} = {04E3E11E-B47D-4599-8AFC-50515A95E715}
 		{B17475BC-45A2-47A3-B8FC-62F3A0959EE0} = {04E3E11E-B47D-4599-8AFC-50515A95E715}
 		{52C7D9B6-E8C8-47D0-9471-652D278D7D77} = {864062D3-A415-4A6F-9324-5820237BA058}
+		{D1295A8F-4F42-461D-A046-564476C10002} = {864062D3-A415-4A6F-9324-5820237BA058}
 		{D18FCF91-8876-48A0-A693-2DC1E7D3D80A} = {864062D3-A415-4A6F-9324-5820237BA058}
 		{1268EADF-8344-431C-81F6-FCB7CBC99F49} = {864062D3-A415-4A6F-9324-5820237BA058}
 		{07BC4495-1267-4B78-9EA6-B76FEEA2A64A} = {864062D3-A415-4A6F-9324-5820237BA058}