Add CVE-2016-1531.txt to support links from external

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+Security fix for CVE-2016-1531
+==============================
+
+All installations having Exim set-uid root and using 'perl_startup' are
+vulnerable to a local privilege escalation. Any user who can start an
+instance of Exim (and this is normally *any* user) can gain root
+privileges.
+
+The official fix is in Exim release 4.86.2. (tagged as exim-4_86_2)
+
+For your convenience we released 4.85.2            (tagged as exim-4_85_2)
+                                 4.84.2            (tagged as exim-4_84_2)
+
+To support package maintainers on older systems we maintain (on a best
+effort basis) GIT branches with backported patches for older releases:
+
+                                exim-4_80_1+CVE-2016-1531
+                                exim-4_82_1+CVE-2016-1531
+
+(We didn't assign GIT tags, to indicate that's nothing real official.)
+
+
+New options
+-----------
+
+We had to introduce two new configuration options:
+
+    keep_environment =
+    add_environment =
+
+Both options are empty per default. That is, Exim cleans the complete
+environment on startup. This affects Exim itself and any subprocesses,
+as transports, that may call other programs via some alias mechanisms,
+as routers (queryprogram), lookups, and so on.
+
+** THIS MAY BREAK your existing installation **
+
+If both options are not used in the configuration, Exim issues a warning
+on startup. This warning disappears if at least one of these options is
+used (even if set to an empty value).
+
+keep_environment should contain a list of trusted environment variables.
+(Do you trust PATH?). This may be a list of names and REs.
+
+    keep_environment = ^LDAP_ : FOO_PATH
+
+To add (or override) variables, you can use add_environment:
+
+    add_environment = <; PATH=/sbin:/usr/sbin
+
+
+New behaviour
+-------------
+
+Now Exim changes its working directory to / right after startup,
+even before reading its configuration. (Later Exim changes its working
+directory to $spool_directory, as usual.)
+
+Exim only accepts an absolute configuration file path now, when using
+the -C option.
+
+
+Thank you for your understanding.