Update config.{sub,guess} scripts

Needed to detect riscv64.

Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>

libffado.spec

@@ -7,7 +7,7 @@
 Summary:        Free firewire audio driver library
 Name:           libffado
 Version:        2.4.7
-Release:        %autorelease
+Release:        %autorelease -e 0.riscv64
 License:        GPLv2 or GPLv3
 URL:            http://www.ffado.org/
 Source0:        http://www.ffado.org/files/%{name}-%{version}.tgz
@@ -87,6 +87,11 @@ sed -i 's|/usr/bin/.*python$|/usr/bin/python3|' \
     support/mixer-qt4/ffado-mixer* support/mixer-qt4/SConscript \
     support/tools/*.py support/tools/SConscript
 
+%ifarch riscv64
+find . -name 'config.sub' -exec cp -vf /usr/lib/rpm/%{?_vendor}/config.sub {} \;
+find . -name 'config.guess' -exec cp -vf /usr/lib/rpm/%{?_vendor}/config.guess {} \;
+%endif
+
 %build
 export CFLAGS="%{optflags} -ffast-math"
 export CXXFLAGS="%{optflags} -ffast-math --std=gnu++11"