Fixed that 'FOR i IN 1..10' with no spaces around '..' returned a syntax error.

This is a fix for "MDEV-10580 sql_mode=ORACLE: FOR loop statement"
The tokenizer now treats digits followed by two dots (e.g. '1..')
as an integer number '1' followed by DOT_DOT_SYM.
Previously this sequence was treated as a double number '1.' followed by '.'.

mysql-test/suite/compat/oracle/r/sp.result

@@ -776,7 +776,7 @@ SELECT @v;
 DROP PROCEDURE p1;
 # Testing the FOR loop statement
 CREATE TABLE t1 (a INT);
-FOR i IN 1 .. 3
+FOR i IN 1..3
 LOOP
 INSERT INTO t1 VALUES (i);
 END LOOP;

mysql-test/suite/compat/oracle/t/sp.test

@@ -849,7 +849,7 @@ DROP PROCEDURE p1;
 
 CREATE TABLE t1 (a INT);
 DELIMITER /;
-FOR i IN 1 .. 3
+FOR i IN 1..3
 LOOP
   INSERT INTO t1 VALUES (i);
 END LOOP;

sql/sql_lex.cc

@@ -1705,8 +1705,13 @@ static int lex_one_token(YYSTYPE *yylval, THD *thd)
       return(IDENT_QUOTED);
     }
     case MY_LEX_INT_OR_REAL:		// Complete int or incomplete real
-      if (c != '.')
-      {					// Found complete integer number.
+      if (c != '.' || lip->yyPeek() == '.')
+      {
+        /*
+          Found a complete integer number:
+          - the number is either not followed by a dot at all, or
+          - the number is followed by a double dot as in: FOR i IN 1..10
+        */
         yylval->lex_str=get_token(lip, 0, lip->yyLength());
 	return int_token(yylval->lex_str.str, (uint) yylval->lex_str.length);
       }