Remove a few unused includes
diff --git a/src/hb-face.cc b/src/hb-face.cc
index 6b563bc..1ba9707 100644
--- a/src/hb-face.cc
+++ b/src/hb-face.cc
@@ -28,15 +28,11 @@
#include "hb-private.hh"
-#include "hb-ot-layout-private.hh"
-
-#include "hb-font-private.hh"
+#include "hb-face-private.hh"
#include "hb-open-file-private.hh"
#include "hb-ot-head-table.hh"
#include "hb-ot-maxp-table.hh"
-#include <string.h>
-
/*
* hb_face_t
diff --git a/src/hb-font.cc b/src/hb-font.cc
index e7f5752..08c00bf 100644
--- a/src/hb-font.cc
+++ b/src/hb-font.cc
@@ -28,14 +28,7 @@
#include "hb-private.hh"
-#include "hb-ot-layout-private.hh"
-
#include "hb-font-private.hh"
-#include "hb-open-file-private.hh"
-#include "hb-ot-head-table.hh"
-#include "hb-ot-maxp-table.hh"
-
-#include <string.h>
/*
diff --git a/src/hb-ot-layout.cc b/src/hb-ot-layout.cc
index d8d6284..d7ededd 100644
--- a/src/hb-ot-layout.cc
+++ b/src/hb-ot-layout.cc
@@ -34,13 +34,10 @@
#include "hb-ot-layout-gdef-table.hh"
#include "hb-ot-layout-gsub-table.hh"
#include "hb-ot-layout-gpos-table.hh"
-#include "hb-ot-layout-jstf-table.hh"
+#include "hb-ot-layout-jstf-table.hh" // Just so we compile it; unused otherwise.
#include "hb-ot-map-private.hh"
-#include <stdlib.h>
-#include <string.h>
-
HB_SHAPER_DATA_ENSURE_DECLARE(ot, face)
diff --git a/src/hb-ot-tag.cc b/src/hb-ot-tag.cc
index 5c348e8..9b0db50 100644
--- a/src/hb-ot-tag.cc
+++ b/src/hb-ot-tag.cc
@@ -28,9 +28,6 @@
#include "hb-private.hh"
-#include <string.h>
-
-
/* hb_script_t */
