Merge pull request ManageIQ#289 from Fryguy/weak_deps

Include weak dependencies of Ruby that we actually need

(cherry picked from commit 97aa8f9)
Modified to remove ruby-default-gems since that does not exist in this version

rpm_spec/subpackages/manageiq-core

@@ -2,6 +2,11 @@
 Summary:  %{product_summary} Core
 
 Requires: ruby
+# Include weak dependencies of Ruby that we actually need
+Requires: rubygem-bigdecimal
+Requires: rubygem-io-console
+Requires: rubygem-irb
+
 Requires: %{name}-gemset = %{version}-%{release}
 
 Requires: ansible >= 5, ansible < 6