Add a2ps Formula

Anything to Postscript converter for printing text, source, etc.
Homebrew Patches adapted from MacPorts port.

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

Formula/a2ps.rb

@@ -0,0 +1,48 @@
+require 'formula'
+
+class A2ps <Formula
+  url 'http://ftp.gnu.org/gnu/a2ps/a2ps-4.14.tar.gz'
+  homepage 'http://www.gnu.org/software/a2ps/'
+  md5 '781ac3d9b213fa3e1ed0d79f986dc8c7'
+
+  def patches
+      DATA
+  end
+
+  def install
+    system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}"
+    system "make install"
+  end
+end
+
+__END__
+# 1) xstrrpl.c is wrongly declaring stpcpy as an external function and the
+# compiler is complaining about the function having only one argument, see 
+# https://svn.macports.org/ticket/20867
+#
+# 2) Fixes build failure on Tiger by reordering args. See
+# http://trac.macports.org/ticket/18255 
+--- a/lib/xstrrpl.c
++++ b/lib/xstrrpl.c
+@@ -22,8 +22,6 @@
+ #include <assert.h>
+ #include "xstrrpl.h"
+
+-extern char * stpcpy();
+-
+ /* Perform subsitutions in string.  Result is malloc'd
+    E.g., result = xstrrrpl ("1234", subst) gives result = "112333"
+    where subst = { {"1", "11"}, {"3", "333"}, { "4", ""}}
+--- a/contrib/sample/Makefile.in
++++ b/contrib/sample/Makefile.in
+@@ -298,7 +298,7 @@
+ AUTOMAKE_OPTIONS = $(top_builddir)/lib/ansi2knr
+ sample_SOURCES = main.c
+ INCLUDES = -I. -I.. -I$(top_builddir) -I$(top_srcdir)/intl -I$(top_srcdir)/lib
+-sample_LDADD = $(top_builddir)/lib/liba2ps.la @LIBINTL@ -lm
++sample_LDADD = -lm $(top_builddir)/lib/liba2ps.la @LIBINTL@
+ all: all-am
+
+ .SUFFIXES:
+