Delete unused docker for centos 6.

diff --git a/misc/docker/centos-6-amd64/Dockerfile b/misc/docker/centos-6-amd64/Dockerfile
deleted file mode 100644 (file)
index d92f64f..0000000
--- a/misc/docker/centos-6-amd64/Dockerfile
+++ /dev/null
@@ -1,11 +0,0 @@
-FROM centos:6
-RUN yum -y upgrade
-RUN yum -y install \
-       autoconf \
-       flex \
-       bison \
-       pkgconfig \
-       'readline-devel' \
-       'pkgconfig(ncurses)' \
-       gcc \
-       make