Split configure step to conf stage

ffmpeg.spec

@@ -692,7 +692,7 @@ sed -i "s|check_host_cflags -O3|check_host_cflags %{optflags}|" configure
 install -m0755 -d _doc/examples
 cp -a doc/examples/{*.c,Makefile,README} _doc/examples/
 
-%build
+%conf
 %set_build_flags
 
 # This is not a normal configure script, don't use %%configure
@@ -942,6 +942,9 @@ for i in H264 HEVC; do
 done
 %endif
 
+%build
+%set_build_flags
+
 %make_build V=1
 %make_build documentation V=1
 %make_build alltools V=1
@@ -970,6 +973,7 @@ rm -rf %{buildroot}%{_datadir}
 %changelog
 * Fri Nov 21 2025 Dominik Mierzejewski <dominik@greysector.net> - 8.0.1-1
 - Update to 8.0.1 (resolves rhbz#2416044)
+- Split configure step to conf stage
 
 * Fri Nov 14 2025 Neal Gompa <ngompa@fedoraproject.org> - 8.0-2
 - Disable lc3 only on RHEL 10