New Formula: FreeXL

FreeXL is a small library written in C that extracts data from Excel .xls
files.

Closes Homebrew/homebrew#9493.

Formula/freexl.rb

@@ -0,0 +1,12 @@
+require 'formula'
+
+class Freexl < Formula
+  homepage 'https://www.gaia-gis.it/fossil/freexl/index'
+  url 'http://www.gaia-gis.it/gaia-sins/freexl-1.0.0b.tar.gz'
+  md5 '5a9c422ed1af7487b626889f3cace2dd'
+
+  def install
+    system "./configure", "--disable-dependency-tracking", "--prefix=#{prefix}"
+    system "make install"
+  end
+end