Adding OSX 10.7 support

Change-Id: I4d1bbee2e03185901f8f1311daab538d2139d597
diff --git a/wscript b/wscript
index 0098546..acd1a9f 100644
--- a/wscript
+++ b/wscript
@@ -105,4 +105,4 @@
         
 class xib(Task.Task):
     color='PINK'
-    run_str = '${IBTOOL} --errors --warnings --notices --minimum-deployment-target 10.8 --output-format human-readable-text  --compile ${TGT} ${SRC}'
+    run_str = '${IBTOOL} --errors --warnings --notices --output-format human-readable-text  --compile ${TGT} ${SRC}'