Bug#23236320: MYSQLTEST DOESN'T NORMALIZE THE CHARACTER_SETS_DIR PATH

              IN ITS OUTPUT ON WINDOWS

Issue :
-------
The mysqltest client does not include CHARACTER_SETS_DIR path in
the list of patterns matched and normalized if found in the output.
This may lead to a result mismatch with MTR expecting a normalized
path with only forward slashes but getting a path with backslashes
for the charsets directory on windows.

Fix :
-----
Adding the path of CHARACTER_SETS_DIR to the list of patterns which
are matched in mysqltest output on windows and normalized.

Reviewed by :
Pavan Naik   <pavan.naik@oracle.com>
RB #12614

Author: Srikanth B R

client/mysqltest.cc

@@ -7366,6 +7366,7 @@ void init_win_path_patterns()
                           "$MYSQLTEST_VARDIR",
                           "$MASTER_MYSOCK",
                           "$MYSQL_SHAREDIR",
+                          "$MYSQL_CHARSETSDIR",
                           "$MYSQL_LIBDIR",
                           "./test/",
                           ".ibd",