Fix typo :)

src/hb-blob.cc

@@ -543,9 +543,10 @@ _hb_mapped_file_destroy (void *file_)
 hb_blob_t *
 hb_blob_create_from_file (const char *file_name)
 {
-#ifdef HB_NO_OEPN
+#ifdef HB_NO_OPEN
   return hb_blob_get_empty ();
 #endif
+
   /* Adopted from glib's gmappedfile.c with Matthias Clasen and
      Allison Lortie permission but changed a lot to suit our need. */
 #if defined(HAVE_MMAP) && !defined(HB_NO_MMAP)

src/hb-config.hh

@@ -62,7 +62,7 @@
 #define HB_NO_MATH
 #define HB_NO_MMAP
 #define HB_NO_NAME
-#define HB_NO_OEPN
+#define HB_NO_OPEN
 #define HB_NO_SETLOCALE
 #define HB_NO_SUBSET_LAYOUT
 #endif