Use 'with' operator in RPM dependency generator.

ruby.spec

@@ -1063,6 +1063,7 @@ make check TESTS="-v $DISABLE_TESTS"
 * Tue Feb 13 2018 Vít Ondruch <vondruch@redhat.com> - 2.5.0-89
 - Drop obsolete ldconfig scriptlets.
 - Add GMP dependency.
+- Use 'with' operator in RPM dependency generator.
 
 * Fri Feb 09 2018 Fedora Release Engineering <releng@fedoraproject.org> - 2.5.0-89
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild

rubygems.req

@@ -52,11 +52,14 @@ module RubyGemsReq
   # Report all gem dependencies including their version.
   def self.gem_depenencies(specification)
     specification.runtime_dependencies.each do |dependency|
-      Helpers::requirement_versions_to_rpm(dependency.requirement).each do |requirement|
-        dependency_string = "rubygem(#{dependency.name})"
-        dependency_string += " #{requirement}" if requirement && requirement.length > 0
-        puts dependency_string
+      dependency_strings = Helpers::requirement_versions_to_rpm(dependency.requirement).map do |requirement|
+        requirement_string = "rubygem(#{dependency.name})"
+        requirement_string += " #{requirement}" if requirement && requirement.length > 0
+        requirement_string
       end
+      dependency_string = dependency_strings.join(' with ')
+      dependency_string.prepend('(').concat(')') if dependency_strings.length > 1
+      puts dependency_string
     end
   end