Add xsltproc package (#2380)

* Added perl_gcstring_linebreak two-in-one package

* Added xsltproc package

* Added comma to xsltproc.rb

* Fixed version number

* Removed conflicting files, in another PR

packages/xsltproc.rb

+require 'package'
+
+class Xsltproc < Package
+  description 'The XSLT C library for GNOME'
+  homepage 'http://xmlsoft.org/XSLT/xsltproc2.html'
+  version '1.1.33-rc1'
+  source_url 'https://git.gnome.org/browse/libxslt/snapshot/libxslt-1.1.33-rc1.tar.xz'
+  source_sha256 '5e257266ba8472c5c319aff87d54140edb950972805cbf5bcf45c4a040c16506'
+
+  def self.build
+    system "./autogen.sh", "--prefix=#{CREW_PREFIX}", "--libdir=#{CREW_LIB_PREFIX}"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end