Adjust the patch to pass test_archdirs(TestRbConfig).

This is hopefuly better aligned with upstream intentions.

ruby-1.9.3-arch-specific-dir.patch

@@ -15,8 +15,8 @@ index d6af000..1c094a3 100644
  rubylibdir='${rubylibprefix}/${ruby_version}'
  rubyarchdir=${multiarch+'${rubyarchprefix}/${ruby_version}'}${multiarch-'${rubylibdir}/${arch}'}
  
-+AC_ARG_WITH(archdir,
-+     AS_HELP_STRING([--with-archdir=DIR], [architecture specific ruby libraries [[LIBDIR/RUBY_BASE_NAME/ARCH]]]),
++AC_ARG_WITH(rubyarchdir,
++     AS_HELP_STRING([--with-rubyarchdir=DIR], [architecture specific ruby libraries [[LIBDIR/RUBY_BASE_NAME/ARCH]]]),
 +            [rubyarchdir=$withval])
 +
  rubyarchprefix=${multiarch+'${archlibdir}/${RUBY_BASE_NAME}'}${multiarch-'${rubylibprefix}/${arch}'}

ruby.spec

@@ -392,7 +392,7 @@ autoconf
 
 %configure \
         --with-rubylibprefix='%{ruby_libdir}' \
-        --with-archdir='%{ruby_libarchdir}' \
+        --with-rubyarchdir='%{ruby_libarchdir}' \
         --with-sitedir='%{ruby_sitelibdir}' \
         --with-sitearchdir='%{ruby_sitearchdir}' \
         --with-vendordir='%{ruby_vendorlibdir}' \