chromium: fix "Aw, snap!" after glibc 2.24 upgrade

See https://bugzilla.redhat.com/show_bug.cgi?id=1361157#c8
cc @domenkozar @aszlig

pkgs/applications/networking/browsers/chromium/common.nix

@@ -128,6 +128,7 @@ let
 
     patches = [
       ./patches/widevine.patch
+      ./patches/glibc-2.24.patch
       (if versionOlder version "52.0.0.0"
        then ./patches/nix_plugin_paths_50.patch
        else ./patches/nix_plugin_paths_52.patch)

pkgs/applications/networking/browsers/chromium/patches/glibc-2.24.patch

@@ -0,0 +1,14 @@
+--- old/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp	2016-08-03 21:02:37.000000000 +0200
++++ new/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp	2016-08-14 10:59:51.395354850 +0200
+@@ -41,6 +41,11 @@
+ #include <errno.h>
+ #include <sys/mman.h>
+ 
++#if OS(LINUX) && defined(MADV_FREE)
++// Added in Linux 4.5, but we don't want to depend on 4.5 at runtime
++#undef MADV_FREE
++#endif
++
+ #ifndef MADV_FREE
+ #define MADV_FREE MADV_DONTNEED
+ #endif