Fix warnings and status position in EOF to OK package conversion

If a client connects to ProxySQL not using CLIENT_DEPRECATE_EOF and it
caches a resultset, when a client using CLIENT_DEPRECATE_EOF executes
the same query it will get a resultset with wrong warnings and status
flags.

This is because warnings and status flags position must be swapped when
converting an EOF packet to an OK packet.

More info about warnings and status flags position in EOF and OK
packets:
https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_basic_eof_packet.html
https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_basic_ok_packet.html

lib/Query_Cache.cpp

@@ -515,8 +515,20 @@ unsigned char* eof_to_ok_packet(QC_entry_t* entry) {
 	// Initialize affected_rows and last_insert_id to zero
 	memset(vp, 0, 2);
 	vp += 2;
-	// Copy the warning an status flags
-	memcpy(vp, it, 4);
+	// Extract warning flags and status from 'EOF_packet'
+	char* eof_packet = entry->value + entry->row_eof_pkt_offset;
+	eof_packet += sizeof(mysql_hdr);
+	// Skip the '0xFE EOF packet header'
+	eof_packet += 1;
+	uint16_t warnings;
+	memcpy(&warnings, eof_packet, sizeof(uint16_t));
+	eof_packet += 2;
+	uint16_t status_flags;
+	memcpy(&status_flags, eof_packet, sizeof(uint16_t));
+	// Copy warnings an status flags
+	memcpy(vp, &status_flags, sizeof(uint16_t));
+	vp += 2;
+	memcpy(vp, &warnings, sizeof(uint16_t));
 	// =======================================
 
 	// Decrement ids after the first EOF