lcov: Apply upstream patch for GCC >= 4.7 compatibility

pkgs/development/tools/analysis/lcov/default.nix

@@ -9,7 +9,8 @@ stdenv.mkDerivation rec {
   };
 
   patches =
-    (stdenv.lib.optional stdenv.isFreeBSD ./freebsd-install.patch);
+    [ ./lcov-except-unreach.patch ]
+    ++ stdenv.lib.optional stdenv.isFreeBSD ./freebsd-install.patch;
 
   preBuild = ''
     makeFlagsArray=(PREFIX=$out BIN_DIR=$out/bin MAN_DIR=$out/share/man)

pkgs/development/tools/analysis/lcov/lcov-except-unreach.patch

@@ -0,0 +1,13 @@
+http://ltp.cvs.sourceforge.net/viewvc/ltp/utils/analysis/lcov/bin/geninfo?r1=1.117&r2=1.118&view=patch
+
+--- a/bin/geninfo	2012/10/10 08:36:16	1.117
++++ b/bin/geninfo	2012/11/13 09:58:53	1.118
+@@ -1833,7 +1833,7 @@
+ 						push(@result, 0);
+ 					} else {
+ 						# Check for zero count
+-						if ($count eq "#####") {
++						if ($count =~ /^[#=]/) {
+ 							$count = 0;
+ 						}
+ 						push(@result, 1);