Drop all distros that are not down with C++11

(cherry picked from commit 7251a81)

release.nix

@@ -180,8 +180,6 @@ let
       };
 
 
-    rpm_fedora18i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.fedora18i386) [];
-    rpm_fedora18x86_64 = makeRPM_x86_64 (diskImageFunsFun: diskImageFunsFun.fedora18x86_64) [];
     rpm_fedora19i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.fedora19i386) [];
     rpm_fedora19x86_64 = makeRPM_x86_64 (diskImageFunsFun: diskImageFunsFun.fedora19x86_64) [];
     rpm_fedora20i386 = makeRPM_i686 (diskImageFuns: diskImageFuns.fedora20i386) [];
@@ -190,15 +188,9 @@ let
     rpm_fedora21x86_64 = makeRPM_x86_64 (diskImageFunsFun: diskImageFunsFun.fedora21x86_64) [ "libsodium-devel" ];
 
 
-    deb_debian7i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.debian7i386) [];
-    deb_debian7x86_64 = makeDeb_x86_64 (diskImageFunsFun: diskImageFunsFun.debian7x86_64) [];
     deb_debian8i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.debian8i386) [ "libsodium-dev" ];
     deb_debian8x86_64 = makeDeb_x86_64 (diskImageFunsFun: diskImageFunsFun.debian8x86_64) [ "libsodium-dev" ];
 
-    deb_ubuntu1210i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1210i386) [];
-    deb_ubuntu1210x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1210x86_64) [];
-    deb_ubuntu1304i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1304i386) [];
-    deb_ubuntu1304x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1304x86_64) [];
     deb_ubuntu1310i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1310i386) [];
     deb_ubuntu1310x86_64 = makeDeb_x86_64 (diskImageFuns: diskImageFuns.ubuntu1310x86_64) [];
     deb_ubuntu1404i386 = makeDeb_i686 (diskImageFuns: diskImageFuns.ubuntu1404i386) [];
@@ -276,8 +268,8 @@ let
           binaryTarball.x86_64-darwin
           #binaryTarball.x86_64-freebsd
           binaryTarball.x86_64-linux
-          deb_debian7i386
-          deb_debian7x86_64
+          deb_debian8i386
+          deb_debian8x86_64
           deb_ubuntu1404i386 # LTS
           deb_ubuntu1404x86_64 # LTS
           deb_ubuntu1504i386