add harfbuzz library

libs/harfbuzz/src/gen-harfbuzzcc.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+
+"This tool is intended to be used from meson"
+
+import os, sys, shutil
+
+if len (sys.argv) < 3:
+	sys.exit (__doc__)
+
+OUTPUT = sys.argv[1]
+CURRENT_SOURCE_DIR = sys.argv[2]
+
+# make sure input files are unique
+sources = sorted(set(sys.argv[3:]))
+
+with open (OUTPUT, "wb") as f:
+	f.write ("".join ('#include "{}"\n'.format (os.path.relpath (os.path.abspath (x), CURRENT_SOURCE_DIR)) for x in sources if x.endswith (".cc")).encode ())
+
+# copy it also to the source tree, but only if it has changed
+baseline_filename = os.path.join (CURRENT_SOURCE_DIR, os.path.basename (OUTPUT))
+with open(baseline_filename, "rb") as baseline:
+	with open(OUTPUT, "rb") as generated:
+		if baseline.read() != generated.read():
+			shutil.copyfile (OUTPUT, baseline_filename)