Bug #36041: mysql-test-run doesn't seem to string match

  100% effectively on Windows

The mysqltest docs state that the 'replace_result' command
doesn't perform any escape processing.
However the current implementation was processing backslash 
escapes in the from/to strings.
This prevents replacing e.g. patch on windows (where backslash
is used as a path separator).
Fixed by removing the backslash escape processing from 
'replace_result'.

client/mysqltest.c

@@ -8094,8 +8094,6 @@ uint replace_len(char * str)
   uint len=0;
   while (*str)
   {
-    if (str[0] == '\\' && str[1])
-      str++;
     str++;
     len++;
   }
@@ -8194,35 +8192,7 @@ REPLACE *init_replace(char * *from, char * *to,uint count,
     }
     for (pos=from[i], len=0; *pos ; pos++)
     {
-      if (*pos == '\\' && *(pos+1))
-      {
-	pos++;
-	switch (*pos) {
-	case 'b':
-	  follow_ptr->chr = SPACE_CHAR;
-	  break;
-	case '^':
-	  follow_ptr->chr = START_OF_LINE;
-	  break;
-	case '$':
-	  follow_ptr->chr = END_OF_LINE;
-	  break;
-	case 'r':
-	  follow_ptr->chr = '\r';
-	  break;
-	case 't':
-	  follow_ptr->chr = '\t';
-	  break;
-	case 'v':
-	  follow_ptr->chr = '\v';
-	  break;
-	default:
-	  follow_ptr->chr = (uchar) *pos;
-	  break;
-	}
-      }
-      else
-	follow_ptr->chr= (uchar) *pos;
+      follow_ptr->chr= (uchar) *pos;
       follow_ptr->table_offset=i;
       follow_ptr->len= ++len;
       follow_ptr++;

mysql-test/r/mysqltest.result

@@ -725,4 +725,7 @@ drop table t1;
 mysqltest: At line 1: change user failed: Unknown database 'inexistent'
 mysqltest: At line 1: change user failed: Access denied for user 'inexistent'@'localhost' (using password: NO)
 mysqltest: At line 1: change user failed: Access denied for user 'root'@'localhost' (using password: YES)
+SELECT 'c:\\a.txt' AS col;
+col
+z
 End of tests

mysql-test/t/mysqltest.test

@@ -2123,6 +2123,13 @@ rmdir $MYSQLTEST_VARDIR/tmp/testdir;
 remove_file $MYSQLTEST_VARDIR/tmp/testdir/file1.txt;
 rmdir $MYSQLTEST_VARDIR/tmp/testdir;
 
+#
+# Bug #36041: mysql-test-run doesn't seem to string match 100% effectively
+# on Windows
+#
+
+--replace_result c:\\a.txt z
+SELECT 'c:\\a.txt' AS col;
 
 --echo End of tests