added mozilla/lib/mac/NSStartup/NSStartup.mcp to the build. This will create NSAppStartup.o, NSComponentStartup.o, and NSLibraryStartup.o, and will permit conditional use of the GC leak detector. r=sdagley

build/mac/NGLayoutBuildList.pm

@@ -909,6 +909,10 @@ sub BuildRuntimeProjects()
 		_BuildProject(":mozilla:lib:mac:InterfaceLib:Interface.mcp",			"MacOS Interfaces");
 	}
 	
+	#// Build all of the startup libraries, for Application, Component, and Shared Libraries. These are
+	#// required for all subsequent libraries in the system.
+	_BuildProject(":mozilla:lib:mac:NSStartup:NSStartup.mcp",							"NSStartup.all");
+	
 	#// for NSRuntime under Carbon, don't use BuildOneProject to alias the shlb or the xsym since the 
 	#// target names differ from the output names. Make them by hand instead.
 	if ( $main::CARBON ) {