BUG#39102: valgrind build does not compile in realpath, which make DATA/INDEX DIR fail

Disable the test case on valgrind. This is a backport to 5.1-rpl of
something that already exists in 5.1 main.

mysql-test/t/partition_not_windows.test

@@ -3,6 +3,8 @@
 --source include/have_partition.inc
 # DATA DIRECTORY/INDEX DIRECTORY require symbolic link support
 --source include/have_symlink.inc
+# realpath is not compiled in when building with valgrind
+--source include/not_valgrind.inc
 
 # The test for Bug 20770 is disabled on Windows due to BUG#19107; it
 # should be moved into partition.test once the bug has been resolved.