!20 fix error when install unbound-libs

From: @eaglegai
Reviewed-by: @zengwefeng,@zengwefeng
Signed-off-by: @zengwefeng,@zengwefeng

unbound.spec

@@ -2,7 +2,7 @@
 
 Name:          unbound
 Version:       1.10.1
-Release:       5
+Release:       6
 Summary:       Unbound is a validating, recursive, caching DNS resolver
 License:       BSD
 Url:           https://nlnetlabs.nl/projects/unbound/about/
@@ -43,7 +43,7 @@ make custom builds or provide specific features to paying customers only.
 
 %package libs
 Summary:       Libraries for %{name}
-Requires:      shadow-utils
+Requires(pre): shadow-utils
 
 %description libs
 Libraries for %{name}.
@@ -231,6 +231,12 @@ popd
 %{_mandir}/man*
 
 %changelog
+* Tue Aug 31 2021 gaihuiying <gaihuiying1@huawei.com> - 1.10.1-6
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:fix error when install unbound-libs
+
 * Thu Aug 26 2021 chenyanpanHW <chenyanpan@huawei.com> - 1.10.1-5
 - Type: requirement
 - ID:   NA