kelbt 0.15 final release

Upgrade kelbt to the final release of this software.
The developer is starting a new project called colm.
See the homepage for more details.
Add a `fails_with :clang` block due to undeclared identifiers.
Not going to bother reporting it.  Works well with llvm on Lion
from XCode-4.3.3.

Closes Homebrew/homebrew#12838.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/kelbt.rb

@@ -1,12 +1,20 @@
 require 'formula'
 
 class Kelbt < Formula
-  url 'http://www.complang.org/kelbt/kelbt-0.14.tar.gz'
   homepage 'http://www.complang.org/kelbt/'
-  md5 '6eeaaa79e665389d7953361d10815fb5'
+  url 'http://www.complang.org/kelbt/kelbt-0.15.tar.gz'
+  sha1 '93b8e839b85ebd4ba99a8b8a0565a73d8e8bcaa1'
+
+  # kelbt-0.15 is the final release.  So this error will be unreported, though
+  # it works well using llvm or gcc.  The dev's new project similar to this
+  # is called colm.  See the homepage for more info.
+  fails_with :clang do
+    build 318
+    cause 'Undeclared identifiers'
+  end
 
   def install
-    system "./configure", "--disable-debug", "--disable-dependency-tracking", "--prefix=#{prefix}"
+    system './configure', "--prefix=#{prefix}"
     system "make install"
   end
 end