patch 7.4.2086

Problem:    Using the system default encoding makes tests unpredictable.
Solution:   Always use utf-8 or latin1 in the new style tests.  Remove setting
            encoding and scriptencoding where it is not needed.

src/testdir/test_expand_dllpath.vim

@@ -1,5 +1,3 @@
-scriptencoding utf-8
-
 func s:test_expand_dllpath(optname)
   let $TEST_EXPAND_DLLPATH = '/dllpath/lib' . substitute(a:optname, '\zedll$', '.', '')
   execute 'let dllpath_save = &' . a:optname