replace echo with printf; fixes compilation when shell is dash and

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19435 b3059339-0415-0410-9bf9-f77b7e298cf2

help/help_diff.sh

@@ -10,7 +10,7 @@ curr=""
 
 while read -r line; do
 	if echo "$line" | grep '^#define' > /dev/null 2>&1; then
-		curr=`echo "$line" | cut -d ' ' -f 2`
+		curr=`printf "%s\n" "$line" | cut -d ' ' -f 2`
 		if grep "^#define $curr[	 ]" $1 > /dev/null 2>&1; then
 			curr=""
 		fi
@@ -21,6 +21,6 @@ while read -r line; do
 	fi
 
 	if [ -n "$curr" ]; then
-		echo "$line"
+		printf "%s\n" "$line"
 	fi
 done