Makefile: Update comment; this is no longer automatucally generated

Change-Id: I75748df90a722462d62067db2db7910035ffb99c
diff --git a/sysmoOCTSIM/gcc/Makefile b/sysmoOCTSIM/gcc/Makefile
index 725c71f..ec43877 100644
--- a/sysmoOCTSIM/gcc/Makefile
+++ b/sysmoOCTSIM/gcc/Makefile
@@ -1,5 +1,5 @@
 ################################################################################
-# Automatically-generated file. Do not edit!
+# Manually edited. Do not overwrite with Automatically-generated file.
 ################################################################################
 
 EXTRA_LIBS=/usr/local/arm-none-eabi/lib/libosmocore.a