Fix FTBFS due to the move of /usr/bin/python into a separate package

See https://fedoraproject.org/wiki/Changes/Move_usr_bin_python_into_separate_package

sord.spec

@@ -3,7 +3,7 @@
 
 Name:       sord
 Version:    0.16.0
-Release:    5%{?dist}
+Release:    6%{?dist}
 Summary:    A lightweight Resource Description Framework (RDF) C library
 
 Group:      System Environment/Libraries
@@ -16,7 +16,9 @@ BuildRequires: doxygen
 BuildRequires: graphviz
 BuildRequires: glib2-devel
 BuildRequires: python2
+BuildRequires: python2-rpm-macros
 BuildRequires: serd-devel >= 0.22.4
+BuildRequires: gcc
 BuildRequires: gcc-c++
 
 %description
@@ -47,7 +49,7 @@ sed -i -e "s|bld.add_post_fun(autowaf.run_ldconfig)||" \
 export CXXFLAGS="%{optflags}"
 export CFLAGS="%{optflags}"
 export LINKFLAGS="%{__global_ldflags}"
-./waf configure \
+%{__python2} waf configure \
     --prefix=%{_prefix} \
     --libdir=%{_libdir} \
     --mandir=%{_mandir} \
@@ -55,10 +57,10 @@ export LINKFLAGS="%{__global_ldflags}"
     --docdir=%{_pkgdocdir} \
     --test \
     --docs 
-./waf build -v %{?_smp_mflags}
+%{__python2} waf build -v %{?_smp_mflags}
 
 %install
-DESTDIR=%{buildroot} ./waf install
+DESTDIR=%{buildroot} %{__python2} waf install
 chmod +x %{buildroot}%{_libdir}/lib%{name}-%{maj}.so.*
 install -pm 644 AUTHORS NEWS README COPYING %{buildroot}%{_pkgdocdir}
 
@@ -84,6 +86,9 @@ install -pm 644 AUTHORS NEWS README COPYING %{buildroot}%{_pkgdocdir}
 %{_mandir}/man3/%{name}*.3*
 
 %changelog
+* Sun Jul 15 2018 Guido Aulisi <guido.aulisi@gmail.com> - 0.16.0-6
+- Fix FTBFS due to the move of /usr/bin/python into a separate package
+
 * Sat Jul 14 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.16.0-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild