Change libtasn1.rb to not create static libraries.

Change URL to mirror URL.
Add check method to perform `make test`.
Increment version number since configuration options are changed.

packages/libtasn1.rb

 require 'package'
 
 class Libtasn1 < Package
-  version '4.10'
-  source_url 'http://ftp.snt.utwente.nl/pub/software/gnu/libtasn1/libtasn1-4.10.tar.gz'
+  version '4.10-1'
+  source_url 'http://ftpmirror.gnu.org/libtasn1/libtasn1-4.10.tar.gz'
   source_sha1 'c7b36fa50866bbc889f7503c7fd1e9f9d7c52a64'
 
   def self.build
-    system './configure --prefix=/usr/local'
+    system "./configure", "--enable-shared", "--disable-static", "--with-pic", "--prefix=/usr/local"
     system "make"
   end
 
   def self.install
     system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
   end
+
+  def self.check
+    system "make", "check"
+  end
 end