try fix dep issue

yast2.spec

@@ -34,26 +34,26 @@ BuildRequires:  grep
 # for some system directories
 BuildRequires:  filesystem
 # for defining abstract methods in libraries
-BuildRequires:  rubygem(abstract_method)
+BuildRequires:  rubygem-abstract_method
 # for file access using augeas
-BuildRequires:  rubygem(cfa)
+BuildRequires:  rubygem-cfa
 # for used augeas lenses
 BuildRequires:  augeas
 # for running scripts
 BuildRequires:  update-desktop-files
-BuildRequires:  rubygem(cheetah)
+BuildRequires:  rubygem-cheetah
 # For running RSpec tests during build
-BuildRequires:  rubygem(rspec)
+BuildRequires:  rubygem-rspec
 # For converting to/from punycode strings
-BuildRequires:  rubygem(simpleidn)
+BuildRequires:  rubygem-simpleidn
 # Needed already in build time
 BuildRequires:  yast2-core >= 2.18.12
 BuildRequires:  yast2-devtools >= 3.1.10
 # Pkg.Resolvables() with "path" search support
 BuildRequires:  yast2-pkg-bindings >= 4.3.7
-BuildRequires:  rubygem(yast-rake)
+BuildRequires:  rubygem-yast-rake
 # for XML module
-BuildRequires:  rubygem(nokogiri)
+BuildRequires:  rubygem-nokogiri
 # log.group call
 BuildRequires:  yast2-ruby-bindings >= 4.5.4
 BuildRequires:  yast2-testsuite
@@ -70,18 +70,18 @@ Requires:       coreutils
 # for GPG.ycp
 Requires:       gpg2
 # for defining abstract methods in libraries
-Requires:       rubygem(abstract_method)
+Requires:       rubygem-abstract_method
 # for file access using augeas
-Requires:       rubygem(cfa)
+Requires:       rubygem-cfa
 # for used augeas lenses
 Requires:       augeas-lenses
 # For converting to/from punycode strings
 Requires:       sysconfig >= 0.80.0
-Requires:       rubygem(simpleidn)
+Requires:       rubygem-simpleidn
 # for running scripts
-Requires:       rubygem(cheetah)
+Requires:       rubygem-cheetah
 # for XML module
-Requires:       rubygem(nokogiri)
+Requires:       rubygem-nokogiri
 # ag_ini section_private
 # ag_ini with (un)quoting support
 Requires:       yast2-core >= 2.23.0