!13 master: delete old so files

From: @hugel 
Reviewed-by: @xiezhipeng1 
Signed-off-by: @xiezhipeng1

libnsl2.spec

@@ -1,5 +1,5 @@
 # Uncomment on initial build for soname bump.
-%global bump_soname 1
+%global bump_soname 0
 %global sover 3
 
 %if 0%{?bump_soname}
@@ -9,7 +9,7 @@
 
 Name:       libnsl2
 Version:    2.0.0
-Release:    1
+Release:    2
 Summary:    Public client interface library for NIS(YP) and NIS+
 License:    BSD and LGPLv2+
 URL:        https://github.com/thkukuk/libnsl
@@ -69,6 +69,9 @@ cp -p %{_libdir}/libnsl.so.%{old_sover}* %{buildroot}/%{_libdir}
 %{_prefix}/include/*
 
 %changelog
+* Fri Apr 15 2022 Hugel<gengqihu1@h-partners.com> - 2.0.0-2
+- delete old so files
+
 * Tue Dec 28 2021 fuanan <fuanan3@huawei.com> - 2.0.0-1
 - update version to 2.0.0