build: python 3 compatibility

Ubuntu 16.04 "xenial xerus" does not come with Python 2.x by default.
It is possible to install a python-2.7 package, but this has its own
problem: no `python` or `python2` symlink (see #7717).

This fixes the following scripts to work with python 3:
- `make check` (bctest,py, bitcoin-util-test.py)
- `make translate` (extract_strings_qt.py)
- `make symbols-check` (symbol-check.py)
- `make security-check` (security-check.py)

Explicitly call the python commands using $(PYTHON) instead
of relying on the interpreter line at the top of the scripts.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/test/bctest.py b/src/test/bctest.py
index 3a8d0ea51b..8105b87ffa 100644
--- a/src/test/bctest.py
+++ b/src/test/bctest.py
@@ -1,7 +1,7 @@
 # Copyright 2014 BitPay, Inc.
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
+from __future__ import division,print_function,unicode_literals
 import subprocess
 import os
 import json
diff --git a/src/test/bitcoin-util-test.py b/src/test/bitcoin-util-test.py
index 20afb16a9e..95dd3e81b4 100755
--- a/src/test/bitcoin-util-test.py
+++ b/src/test/bitcoin-util-test.py
@@ -2,7 +2,7 @@
 # Copyright 2014 BitPay, Inc.
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
+from __future__ import division,print_function,unicode_literals
 import os
 import bctest
 import buildenv