Force C++14 as this code is not C++17 ready

dpkg.spec

@@ -3,7 +3,7 @@
 
 Name:           dpkg
 Version:        1.19.7
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        Package maintenance system for Debian Linux
 # The entire source code is GPLv2+ with exception of the following
 # lib/dpkg/md5.c, lib/dpkg/md5.h - Public domain
@@ -169,6 +169,7 @@ EOF
 chmod +x %{__perl_requires}
 
 %build
+export CXXFLAGS="-std=c++14 $RPM_OPT_FLAGS"
 autoreconf
 %configure --disable-linker-optimisations \
         --with-admindir=%{_localstatedir}/lib/dpkg \
@@ -454,6 +455,9 @@ create_logfile
 
 
 %changelog
+* Tue Aug 14 2020 Jeff Law <law@redhat.com> - 1.19.7-8
+- Force C++14 as this code is not C++17 ready
+
 * Mon Jul 27 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.19.7-7
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild