break characters any characters that are commonly used in file
names, such as '-', '+', '~', etc. Otherwise, readline displays
incorrect completion candidates. */
-#ifdef __MSDOS__
+#if HAVE_DOS_BASED_FILE_SYSTEM
/* MS-DOS and MS-Windows use colon as part of the drive spec, and most
programs support @foo style response files. */
static char *gdb_completer_file_name_break_characters = " \t\n*|\"';?><@";