Fix build in all arches

- enable-fixed-point in arm and powerpc to fix the build as Debian did
- remove a non existing option ambisonics

opus.spec

@@ -36,7 +36,11 @@ cp %{SOURCE2} .
 
 %build
 %configure --enable-custom-modes --disable-static \
-           --enable-hardening --enable-ambisonics
+           --enable-hardening \
+%ifarch %{arm} %{arm64} %{power64}
+        --enable-fixed-point
+%endif
+
 
 %make_build
 
@@ -67,6 +71,7 @@ make check %{?_smp_mflags} V=1
 %changelog
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 1.3.1-12
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
+- Fix build in all arches, copied from Debian
 
 * Fri Jul 22 2022 Fedora Release Engineering <releng@fedoraproject.org> - 1.3.1-11
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild