antlr: Use official sources (#4662)

The tarball used until now is not available anymore.

var/spack/repos/builtin/packages/antlr/gcc.patch

@@ -0,0 +1,15 @@
+Description: Adds missing includes to fix FTBFS.
+
+Index: antlr-2.7.7/lib/cpp/antlr/CharScanner.hpp
+===================================================================
+--- antlr-2.7.7.orig/lib/cpp/antlr/CharScanner.hpp	2006-11-01 22:37:17.000000000 +0100
++++ antlr-2.7.7/lib/cpp/antlr/CharScanner.hpp	2009-01-15 20:47:53.000000000 +0100
+@@ -17,6 +17,8 @@
+ #else
+ #include <cctype>
+ #endif
++#include <cstdio>
++#include <cstring>
+ 
+ #if ( _MSC_VER == 1200 )
+ // VC6 seems to need this

var/spack/repos/builtin/packages/antlr/package.py

@@ -32,22 +32,13 @@ class Antlr(AutotoolsPackage):
     frameworks. From a grammar, ANTLR generates a parser that can build and
     walk parse trees."""
 
-    homepage = "http://www.antlr.org"
-    url      = "https://github.com/antlr/antlr/tarball/v2.7.7"
+    homepage = "http://www.antlr2.org/"
+    url      = "http://www.antlr2.org/download/antlr-2.7.7.tar.gz"
 
-    # Notes from http://nco.sourceforge.net/#bld
-    # The first steps to build (i.e., compile, for the most part) NCO from
-    # source code are to install the pre-requisites: ANTLR version 2.7.7
-    # (like this one not version 3.x or 4.x!) (required for ncap2)... ANTLR
-    # binaries from major distributions are pre-built with the source patch
-    # necessary to allow NCO to link to ANTLR... The ANTLR source file
-    # CharScanner.hpp must include this line: #include <cstring> or else
-    # ncap2 will not compile (this tarball is already patched).
-    version('2.7.7', '914865e853fe8e1e61a9f23d045cb4ab',
-            # Patched version as described above
-            url='http://dust.ess.uci.edu/tmp/antlr-2.7.7.tar.gz')
-    # Unpatched version
-    # url='http://dust.ess.uci.edu/nco/antlr-2.7.7.tar.gz')
+    version('2.7.7', '01cc9a2a454dd33dcd8c856ec89af090')
+
+    # Fixes build with recent versions of GCC
+    patch('gcc.patch')
 
     variant('cxx',    default=True,  description='Enable ANTLR for C++')
     variant('java',   default=False, description='Enable ANTLR for Java')