MDEV-25444 mysql --binary-mode is not able to replay some mysqlbinlog outputs

Problem:- Some binary data is inserted into the table using Jconnector. When
binlog dump of the data is applied using mysql cleint it gives syntax error.

Reason:-
After investigating it turns out to be a issue of mysql client not able to properly
handle  \\\0 <0 in binary>. In all binary files where mysql client fails to insert
these 2 bytes are commom (0x5c00)

Solution:-
I have changed mysql.cc to include for the possibility that binary string can
have \\\0 in it

client/mysql.cc

@@ -2319,8 +2319,12 @@ static bool add_line(String &buffer, char *line, size_t line_length,
     {
       // Found possbile one character command like \c
 
-      if (!(inchar = (uchar) *++pos))
-	break;				// readline adds one '\'
+      inchar = (uchar) *++pos;
+      // In Binary mode , when in_string is not null \0 should not be treated as
+      // end statement. This can happen when we are in middle of binary data which
+      // can contain \0 and its quoted with ' '.
+      if (!real_binary_mode && !*in_string && !inchar)
+        break;				// readline adds one '\'
       if (*in_string || inchar == 'N')	// \N is short for NULL
       {					// Don't allow commands in string
 	*out++='\\';

mysql-test/main/binary_zero_insert.result

+CREATE TABLE `tb` (`id` int(11) NOT NULL AUTO_INCREMENT,`cb` longblob DEFAULT NULL,
+PRIMARY KEY (`id`)) ENGINE=myisam AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;
+select count(*)=2 from tb;
+count(*)=2
+1
+drop table tb;

mysql-test/main/binary_zero_insert.test

+#
+# MDEV-25444 mysql --binary-mode is not able to replay some mysqlbinlog outputs
+#
+# After investigating it turns out to be a issue of mysql client not able to properly
+#  handle  \\\0 <0 in binary>.
+# In this test case we will be pipelining binary_zero_insert.bin into  mysql client.
+# binary_zero_insert.bin contains insert stmt with \\\0
+
+CREATE TABLE `tb` (`id` int(11) NOT NULL AUTO_INCREMENT,`cb` longblob DEFAULT NULL,
+PRIMARY KEY (`id`)) ENGINE=myisam AUTO_INCREMENT=5 DEFAULT CHARSET=latin1;
+
+--exec $MYSQL --binary-mode  test < $MYSQL_TEST_DIR/std_data/binary_zero_insert.bin
+select count(*)=2 from tb;
+
+drop table tb;