Qualify relative paths

Author: commonsensesoftware

after.apiversioning.sln.targets

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
- <Import Project="build\signing.targets" />
+ <Import Project="$(MSBuildThisFileDirectory)\build\signing.targets" />
 
  <Target Name="AfterSolutionBuild" AfterTargets="Build">
 
@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-   <Projects Include="src\**\*.csproj" />
+   <Projects Include="$(MSBuildThisFileDirectory)\src\**\*.csproj" />
   </ItemGroup>
 
   <MSBuild Projects="@(Projects)" Targets="GetTargetPaths" Properties="$(BuildProperties)" UnloadProjectsOnCompletion="true">