Use the DRIVE_* API constants instead of the DRIVETYPE enum.
Changed DRIVE_CANNOTDETERMINE and DRIVE_DOESNOTEXIST to use the
correct names.
Cleaned up a few dependencies on internal drive.c functions.

diff --git a/controls/listbox.c b/controls/listbox.c
index e4e69c9..18bebd5 100644
--- a/controls/listbox.c
+++ b/controls/listbox.c
@@ -13,7 +13,6 @@
 #include "wine/winbase16.h"
 #include "winuser.h"
 #include "winerror.h"
-#include "drive.h"
 #include "heap.h"
 #include "spy.h"
 #include "selectors.h"
@@ -1736,10 +1735,11 @@
     if ((ret >= 0) && (attrib & DDL_DRIVES))
     {
         char buffer[] = "[-a-]";
+        char root[] = "A:\\";
         int drive;
-        for (drive = 0; drive < MAX_DOS_DRIVES; drive++, buffer[2]++)
+        for (drive = 0; drive < 26; drive++, buffer[2]++, root[0]++)
         {
-            if (!DRIVE_IsValid(drive)) continue;
+            if (GetDriveTypeA(root) <= DRIVE_NO_ROOT_DIR) continue;
             if ((ret = LISTBOX_InsertString( wnd, descr, -1, buffer )) < 0)
                 break;
         }