icedtea7: Fix building v2.4.6 by backporting fix

See http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1726

pkgs/development/compilers/icedtea/build-fix-2.4.6.patch

@@ -0,0 +1,58 @@
+
+# HG changeset patch
+# User Andrew John Hughes <gnu_andrew@member.fsf.org>
+# Date 1396030366 0
+# Node ID e8e59c50a451b45bd10cd495b81e5c61b2b4bca8
+# Parent  46f9059509fec2498b1a04ccefee538a45aeff8c
+PR1726: configure fails looking for ecj.jar before even trying to find javac
+
+2014-03-28  Andrew John Hughes  <gnu.andrew@redhat.com>
+
+	* acinclude.m4:
+	(IT_FIND_COMPILER): Check value of ECJ_JAR
+	and JAVAC here ...
+	(IT_FIND_ECJ_JAR): ... rather than here where
+	${JAVAC} may not yet be defined.
+
+diff -r 46f9059509fe -r e8e59c50a451 NEWS
+--- a/NEWS	Fri Mar 28 18:06:31 2014 +0000
++++ b/NEWS	Fri Mar 28 18:12:46 2014 +0000
+@@ -14,6 +14,9 @@
+ 
+ New in release 2.4.7 (2014-04-XX):
+ 
++* Bug fixes
++  - PR1726: configure fails looking for ecj.jar before even trying to find javac
++
+ New in release 2.4.6 (2014-03-28):
+ 
+ * Backports
+diff -r 46f9059509fe -r e8e59c50a451 acinclude.m4
+--- a/acinclude.m4	Fri Mar 28 18:06:31 2014 +0000
++++ b/acinclude.m4	Fri Mar 28 18:12:46 2014 +0000
+@@ -134,6 +134,12 @@
+   IT_USING_ECJ
+   IT_WITH_GCJ
+   
++  if test "x${ECJ_JAR}" = "xno"; then
++    if test "x${JAVAC}" = "x"; then
++      AC_MSG_ERROR("No compiler or ecj JAR file was found.")
++    fi
++  fi
++
+   if test x"${GCJ}" != xno ; then
+     JAVAC="${JAVA} -classpath ${ECJ_JAR} org.eclipse.jdt.internal.compiler.batch.Main"
+   fi
+@@ -350,11 +356,6 @@
+       fi
+   fi
+   AC_MSG_RESULT(${ECJ_JAR})
+-  if test "x${ECJ_JAR}" = "xno"; then
+-    if test "x${JAVAC}" = "x"; then
+-      AC_MSG_ERROR("No compiler or ecj JAR file was found.")
+-    fi
+-  fi
+   AC_SUBST(ECJ_JAR)
+ ])
+ 
+

pkgs/development/compilers/icedtea/default.nix

@@ -43,6 +43,8 @@ with srcInfo; stdenv.mkDerivation {
     inherit url sha256;
   };
 
+  patches = [ ./build-fix-2.4.6.patch ];
+
   outputs = [ "out" "jre" ];
 
   # TODO: Probably some more dependencies should be on this list but are being