added shell script 'testdup.sh' for locate duplicate includes

Signed-off-by: Ilia Maslakov <il.smind@gmail.com>

maint/testdup.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+echo "test lib/*"
+for i in `find src -name '*.[ch]'`; do
+    ./maint/dupincludes.pl $i
+done
+
+echo "test srs/*"
+for i in `find lib -name '*.[ch]'`; do
+    ./maint/dupincludes.pl $i
+done
+