Added global:: prefix to full namespace qualified [CompilerGenerated] attribute to avoid any possible conflicts with the namespace of the host project.

Author: sponge-b0b

src/GitVersionTask/AssemblyInfoBuilder/AssemblyInfoBuilder.cs

@@ -30,7 +30,7 @@ public string GetAssemblyInfoText(VersionVariables vars, string rootNamespace)
 namespace {4}
 {{
 
-    [System.Runtime.CompilerServices.CompilerGenerated]
+    [global::System.Runtime.CompilerServices.CompilerGenerated]
     static class GitVersionInformation
     {{
 {3}