fix build error for loongarch64

Signed-off-by: Wenlong Zhang <zhangwenlong@loongson.cn>

libvpx.spec

@@ -1,6 +1,6 @@
 Name:                   libvpx
 Version:                1.12.0
-Release:                1
+Release:                2
 Summary:                VP8/VP9 Video Codec SDK
 License:                BSD
 Source0:                https://github.com/webmproject/libvpx/archive/v%{version}.tar.gz
@@ -33,8 +33,11 @@ Development libraries and headers for developing software against libvpx.
 %else
 %ifarch aarch64
 %global vpxtarget arm64-linux-gcc
+%else
+%global vpxtarget generic-gnu
 %endif
 %endif
+
 %set_build_flags
 
 ./configure --target=%{vpxtarget} \
@@ -102,6 +105,9 @@ mv %{buildroot}%{_prefix}/src/vpx_scale %{buildroot}%{_includedir}/
 %{_libdir}/libvpx.so
 
 %changelog
+* Mon May  8 2023 Wenlong Zhang <zhangwenlong@loongson.cn> - 1.12.0-2
+- fix build error for loongarch64
+
 * Sat Feb 04 2023 wenchaofan <349464272@qq.com> - 1.12.0-1
 - Update to 1.12.0 version