Disable BR on kexec-tools for riscv64

kexec is supported for riscv64 on the kernel side, but the tooling side
is not yet upstreamed. Status is unknown.

During Pungi compose this causes issues with dnf repoclosure (unresolved
dependency).

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

abrt.spec

@@ -50,7 +50,7 @@
 Summary: Automatic bug detection and reporting tool
 Name: abrt
 Version: 2.17.1
-Release: 1%{?dist}
+Release: 1.0.riscv64%{?dist}
 License: GPL-2.0-or-later
 URL: https://abrt.readthedocs.org/
 Source: https://github.com/abrt/%{name}/archive/%{version}/%{name}-%{version}.tar.gz
@@ -248,7 +248,9 @@ log.
 Summary: %{name}'s vmcore addon
 Requires: %{name} = %{version}-%{release}
 Requires: abrt-addon-kerneloops
+%ifnarch riscv64
 Requires: kexec-tools
+%endif
 %if %{with python3}
 Requires: python3-abrt
 Requires: python3-augeas
@@ -966,6 +968,9 @@ killall abrt-dbus >/dev/null 2>&1 || :
 %config(noreplace) %{_sysconfdir}/profile.d/abrt-console-notification.sh
 
 %changelog
+* Sat Sep 02 2023 David Abdurachmanov <davidlt@rivosinc.com> - 2.17.1-1.0.riscv64
+- Disable BR for kexec-tools on riscv64 (not supported)
+
 * Fri Jun 30 2023 Michal Srb <michal@redhat.com> - 2.17.1-1
 - Update to upstream release 2.17.1