vim-patch:8.2.0010: test64 is old style

Problem:    Test64 is old style.
Solution:   Convert to new style test. (Yegappan Lakshmanan, closes vim/vim#5363)
f9cb05c147

test/functional/legacy/095_regexp_multibyte_spec.lua

@@ -1,5 +1,5 @@
 -- Test for regexp patterns with multi-byte support, using utf-8.
--- See test64 for the non-multi-byte tests.
+-- See test_regexp_latin.vim for the non-multi-byte tests.
 -- A pattern that gives the expected result produces OK, so that we know it was
 -- actually tried.