Unignore merge.targets

The merge.targets will get merged into the generated .targets file for a given nuget package.  This was being gitignored and not properly making it in.  This target helps us check the version of android tools installed and adds the —no-version-vectors flag to aapt calls.

Author: Redth

.gitignore

@@ -16,7 +16,7 @@ output/
 *.xcuserstate
 *.csproj.user
 */nuget/*.targets
-
+!merge.targets
 
 Resource.designer.cs
 component.yaml

vector-drawable/nuget/merge.targets

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!-- 
+    * 
+    * Xamarin Android Support Vector Drawable MSBuild Tasks
+    * 
+  -->
+  <PropertyGroup>
+    <VectorDrawableCheckBuildToolsVersionTaskFilename Condition=" '$(VectorDrawableCheckBuildToolsVersionTaskFilename)' == '' ">$(MSBuildThisFileDirectory)Xamarin.Android.Support.Tasks.VectorDrawable.dll</VectorDrawableCheckBuildToolsVersionTaskFilename>
+  </PropertyGroup>
+
+  <!-- set some defaults -->
+  <PropertyGroup>
+    <VectorDrawableCheckBuildToolsVersionTaskDependsOn>
+       _ResolveMonoAndroidSdks;$(VectorDrawableCheckBuildToolsVersionTaskDependsOn);
+    </VectorDrawableCheckBuildToolsVersionTaskDependsOn>
+    <VectorDrawableCheckBuildToolsVersionTaskBeforeTargets>
+      UpdateAndroidResgen;$(VectorDrawableCheckBuildToolsVersionTaskBeforeTargets);
+    </VectorDrawableCheckBuildToolsVersionTaskBeforeTargets>
+  </PropertyGroup>
+
+  <!-- include the task assembly -->
+  <UsingTask 
+      AssemblyFile="$(VectorDrawableCheckBuildToolsVersionTaskFilename)" 
+      TaskName="Xamarin.Android.Support.Tasks.VectorDrawableCheckBuildToolsVersionTask" />
+
+  <!-- the build tasks -->
+  <Target
+    Name="VectorDrawableCheckBuildToolsVersionTask" 
+    Condition=""
+    BeforeTargets="$(VectorDrawableCheckBuildToolsVersionTaskBeforeTargets)">
+
+    <VectorDrawableCheckBuildToolsVersionTask
+      AndroidSdkBuildToolsPath="$(AndroidSdkBuildToolsPath)">
+    </VectorDrawableCheckBuildToolsVersionTask>
+  </Target>
+
+  <Target 
+    Name="_XamarinAndroidSupportVectorDrawableArgs"
+		BeforeTargets="_UpdateAndroidResgen">
+      <!-- Adds an argument to the call to aapt to support vectors -->
+      <PropertyGroup Condition="!($(AndroidResgenExtraArgs.Contains('--no-version-vectors')))">
+          <AndroidResgenExtraArgs>$(AndroidResgenExtraArgs.Trim()) --no-version-vectors</AndroidResgenExtraArgs>
+      </PropertyGroup>
+  </Target>
+
+</Project>