BF: use snapshots.debian.org instead of mirrors.kernel.org for guaranteed avail of elderly libpng12-0 pkg

Author: yarikoptic

neurodocker/templates/afni.yaml

@@ -23,7 +23,7 @@ generic:
         tcsh xorg-x11-fonts-misc xorg-x11-server-Xvfb
       debs:
         - http://mirrors.kernel.org/debian/pool/main/libx/libxp/libxp6_1.0.2-2_amd64.deb
-        - http://mirrors.kernel.org/debian/pool/main/libp/libpng/libpng12-0_1.2.49-1%2Bdeb7u2_amd64.deb
+        - http://snapshot.debian.org/archive/debian-security/20160113T213056Z/pool/updates/main/libp/libpng/libpng12-0_1.2.49-1%2Bdeb7u2_amd64.deb
     instructions: |
       {{ afni.install_dependencies() }}
       {{ afni.install_debs() }}
@@ -57,7 +57,7 @@ generic:
         openmotif-devel R R-devel tcsh zlib-devel
       debs:
         - http://mirrors.kernel.org/debian/pool/main/libx/libxp/libxp6_1.0.2-2_amd64.deb
-        - http://mirrors.kernel.org/debian/pool/main/libp/libpng/libpng12-0_1.2.49-1%2Bdeb7u2_amd64.deb
+        - http://snapshot.debian.org/archive/debian-security/20160113T213056Z/pool/updates/main/libp/libpng/libpng12-0_1.2.49-1%2Bdeb7u2_amd64.deb
     instructions: |
       {{ afni.install_dependencies() }}
       {{ afni.install_debs() }}