Add buildrequires rubygem(rexml) to fix cannot load rexml

Signed-off-by: cherry530 <xuping33@huawei.com>
(cherry picked from commit fc3230b8d4b6f627d96ad5d0c06b5db3b634fd8a)

rubygem-maruku.spec

@@ -1,12 +1,13 @@
 %define gem_name maruku
 Name:                rubygem-%{gem_name}
 Version:             0.7.2
-Release:             1
+Release:             2
 Summary:             Maruku is a Markdown-superset interpreter written in Ruby
 License:             MIT and BSD
 URL:                 http://github.com/bhollis/maruku
 Source0:             https://rubygems.org/gems/%{gem_name}-%{version}.gem
 BuildRequires:       ruby(release) rubygems-devel ruby rubygem(rspec)
+BuildRequires:       rubygem(rexml)
 BuildArch:           noarch
 %description
 Maruku is a Markdown interpreter in Ruby. It features native export to HTML
@@ -58,5 +59,8 @@ popd
 %{gem_instdir}/spec
 
 %changelog
+* Fri Feb 11 2022 xu_ping <xuping33@huawei.com> - 0.7.2-2
+- Add buildrequires rubygem(rexml) to fix cannot load rexml
+
 * Wed Aug 19 2020 geyanan <geyanan2@huawei.com> - 0.7.2-1
 - package init