[ruby] Change to backport error number.

[Vít Ondruch]

commit 65fdd909e82e0d4103bfe60b0e569000e904e109
Author: Vít Ondruch <vondruch at redhat.com>
Date:   Fri Feb 22 12:09:14 2013 +0100

    Change to backport error number.

 ruby.spec |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/ruby.spec b/ruby.spec
index ce2cd8b..e111f17 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -566,7 +566,7 @@ DISABLE_TESTS="-x test_process.rb $DISABLE_TESTS"
 %endif
 
 # The TestRbConfig errors, which does not respect configuration options.
-# http://bugs.ruby-lang.org/issues/7902
+# http://bugs.ruby-lang.org/issues/7912
 DISABLE_TESTS="-x test_rbconfig.rb $DISABLE_TESTS"
 
 make check TESTS="-v $DISABLE_TESTS"