upx: enable lzma compression

upx can compress 30% better using lzma. Per user request, add
a subformula to extract the lzma sdk into the buildpath and
unleash greatness.

Fixes #15413

Closes #15496.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Library/Formula/upx.rb

@@ -1,15 +1,24 @@
 require 'formula'
 
+class Lzma < Formula
+  url 'http://sourceforge.net/projects/sevenzip/files/LZMA%20SDK/4.65/lzma465.tar.bz2'
+  sha1 '5ec1c4606fec88c770a9712073e83916f8aed173'
+end
+
 class Upx < Formula
-  url 'http://upx.sourceforge.net/download/upx-3.08-src.tar.bz2'
-  head 'http://upx.hg.sourceforge.net:8000/hgroot/upx/upx', :using => :hg
   homepage 'http://upx.sourceforge.net'
+  url 'http://upx.sourceforge.net/download/upx-3.08-src.tar.bz2'
   sha1 '5ccbc0aacfd3aaee407eceab06ec5989bf1d153a'
+  head 'http://upx.hg.sourceforge.net:8000/hgroot/upx/upx', :using => :hg
 
   depends_on 'ucl'
 
   def install
+    Lzma.new.brew {(buildpath+'lzmasdk').install Dir['*']}
+    ENV['UPX_LZMADIR'] = (buildpath+'lzmasdk')
+    ENV['UPX_LZMA_VERSION'] = '0x465'
     system "make all"
-    bin.install "src/upx.out" => "upx"
+    bin.install  'src/upx.out' => 'upx'
+    man1.install 'doc/upx.1'
   end
 end