updated for version 7.4.684
Problem: When starting several Vim instances in diff mode, the temp files
used may not be unique. (Issue 353)
Solution: Add an argument to vim_tempname() to keep the file.
diff --git a/src/proto/fileio.pro b/src/proto/fileio.pro
index 45e7b38..32d7bce 100644
--- a/src/proto/fileio.pro
+++ b/src/proto/fileio.pro
@@ -23,7 +23,7 @@
void buf_store_time __ARGS((buf_T *buf, struct stat *st, char_u *fname));
void write_lnum_adjust __ARGS((linenr_T offset));
void vim_deltempdir __ARGS((void));
-char_u *vim_tempname __ARGS((int extra_char));
+char_u *vim_tempname __ARGS((int extra_char, int keep));
void forward_slash __ARGS((char_u *fname));
void aubuflocal_remove __ARGS((buf_T *buf));
int au_has_group __ARGS((char_u *name));