Depend on %{_bindir}/2to3 instead of python2-tools

Now it is in python3-tools. We should not care about package names,
but should on binaries.

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

python-crypto.spec

@@ -10,7 +10,7 @@
 Summary:	Cryptography library for Python
 Name:		python-crypto
 Version:	2.6.1
-Release:	17%{?dist}
+Release:	18%{?dist}
 # Mostly Public Domain apart from parts of HMAC.py and setup.py, which are Python
 License:	Public Domain and Python
 URL:		http://www.pycrypto.org/
@@ -26,8 +26,7 @@ BuildRequires:	gmp-devel >= 4.1
 BuildRequires:	libtomcrypt-devel >= 1.16
 BuildRequires:	python%{python2_pkgversion}-devel >= 2.4
 BuildRequires:	python%{python3_pkgversion}-devel
-# python2-tools needed for 2to3
+BuildRequires:	%{_bindir}/2to3
-BuildRequires:	python2-tools
 
 %description
 PyCrypto is a collection of both secure hash functions (such as MD5 and
@@ -110,6 +109,9 @@ PYTHONPATH=%{buildroot}%{python3_sitearch} %{__python3} pct-speedtest3.py
 %{python3_sitearch}/pycrypto-%{version}-py3.*.egg-info
 
 %changelog
+* Tue Sep 05 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 2.6.1-18
+- Depend on %%{_bindir}/2to3 instead of python2-tools
+
 * Thu Aug 03 2017 Fedora Release Engineering <releng@fedoraproject.org> - 2.6.1-17
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Binutils_Mass_Rebuild