removed debug output (caused compiler warning dialog to open in COOJA)

Author: nfi

Makefile.include

@@ -25,7 +25,6 @@ ifndef HOST_OS
   ifeq ($(OS),Windows_NT)
   ## TODO: detect more specific Windows set-ups,
   ## e.g. CygWin, MingW, VisualC, Watcom, Interix
-    $(warning Windows (NT) detected.)
     HOST_OS := Windows
   else
     HOST_OS := $(shell uname)