build: make Python scripts compatible with Python 2.x

They were originally written for Python 3.x. Changing them to work on
Python 2.x as well is trivial. Tested with Python 2.7.3 and 3.2.3.

TOOLS/file2string.py

@@ -7,6 +7,10 @@
 
 import sys
 
+# Indexing a byte string yields int on Python 3.x, and a str on Python 2.x
+def pord(c):
+    return ord(c) if type(c) == str else c
+
 def main(infile):
     conv = ['\\' + ("%03o" % c) for c in range(256)]
     safe_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" \
@@ -16,7 +20,7 @@ def main(infile):
     for c, esc in ("\nn", "\tt", r"\\", '""'):
         conv[ord(c)] = '\\' + esc
     for line in infile:
-        sys.stdout.write('"' + ''.join(conv[c] for c in line) + '"\n')
+        sys.stdout.write('"' + ''.join(conv[pord(c)] for c in line) + '"\n')
 
 with open(sys.argv[1], 'rb') as infile:
     sys.stdout.write("// Generated from %s\n\n" % sys.argv[1])

TOOLS/matroska.py

@@ -22,6 +22,8 @@ Can also be used to directly parse Matroska files and display their contents.
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 #
 
+# for compatibility with Python 2.x
+from __future__ import print_function
 
 elements_ebml = (
     'EBML, 1a45dfa3, sub', (