!17 Fix riscv64 build error

From: @misaka00251 
Reviewed-by: @peijiankang 
Signed-off-by: @peijiankang

biometric-authentication.spec

@@ -1,6 +1,6 @@
 Name:           biometric-authentication
 Version:        0.9.72
-Release:        5
+Release:        6
 Summary:        biometric-authentication
 License:        LGPL-3.0
 URL:            http://www.ukui.org
@@ -12,6 +12,9 @@ Source0:        %{name}-%{version}.tar.gz
 %ifarch aarch64
 %global platform aarch64
 %endif
+%ifarch riscv64
+%global platform riscv64
+%endif
 
 BuildRequires: python3
 BuildRequires: automake
@@ -167,6 +170,9 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
+* Wed Mar 01 2023 misaka00251 <liuxin@iscas.ac.cn> - 0.9.72-6
+- Fix riscv64 build error
+
 * Wed Mar 01 2023 peijiankang <peijiankang@kylinos.cn> - 0.9.72-5
 - remove rpath of biometric-authentication