updated for version 7.4.235
Problem: It is not easy to get the full path of a command.
Solution: Add the exepath() function.
diff --git a/src/proto/os_msdos.pro b/src/proto/os_msdos.pro
index a867f3d..e755211 100644
--- a/src/proto/os_msdos.pro
+++ b/src/proto/os_msdos.pro
@@ -38,7 +38,7 @@
int mch_setperm __ARGS((char_u *name, long perm));
void mch_hide __ARGS((char_u *name));
int mch_isdir __ARGS((char_u *name));
-int mch_can_exe __ARGS((char_u *name));
+int mch_can_exe __ARGS((char_u *name, char_u **path));
int mch_nodetype __ARGS((char_u *name));
int mch_dirname __ARGS((char_u *buf, int len));
int mch_remove __ARGS((char_u *name));