Add support for maxcpucount

Author: Redth

build.cake

@@ -16,6 +16,8 @@
 var TARGET = Argument ("t", Argument ("target", "Default"));
 var BUILD_CONFIG = Argument ("config", "Release");
 var VERBOSITY = (Verbosity) Enum.Parse (typeof(Verbosity), Argument ("v", Argument ("verbosity", "Normal")), true);
+var CPUS = Int.Parse(Argument("maxcpucount", "-1"));
+int? MAX_CPU_COUNT = CPUS < 0 ? (int?)null : (int?)CPUS;
 
 // Lists all the artifacts and their versions for com.android.support.*
 // https://dl.google.com/dl/android/maven2/com/android/support/group-index.xml
@@ -122,6 +124,7 @@ Task("nuget")
 {
 	MSBuild ("./generated/AndroidSupport.sln", c => {
 		c.Configuration = "Release";
+		c.MaxCpuCount = MAX_CPU_COUNT;
 		c.Targets.Clear();
 		c.Targets.Add("Pack");
 		c.Properties.Add("PackageOutputPath", new [] { MakeAbsolute(new FilePath("./output")).FullPath });