file.c: do not include unused headers

* file.c: Do not include <fcntl.h>.
diff --git a/file.c b/file.c
index 8dd0231..9a1b94f 100644
--- a/file.c
+++ b/file.c
@@ -179,8 +179,6 @@
 #undef st_mtime
 #undef st_ctime
 
-#include <fcntl.h>
-
 #ifdef MAJOR_IN_SYSMACROS
 # include <sys/sysmacros.h>
 #endif