Apply debian/patches/61_replace_dash_with_bash_mbug675185.dpatch

We have carried along this patch as a patch inside our sources
since 2012 (commit cfd4fcb).

The validity of this has thus been vetted in production for years
and the review done now did not find otherwise.

A race in dash causes mysqld_safe to occasionally loop infinitely.
Fix by using bash instead.

https://bugs.launchpad.net/ubuntu/+source/mysql-dfsg-5.0/+bug/675185

As this is the last patch, we can also clean away usage of dpatch.

debian/control

@@ -8,7 +8,6 @@ Build-Depends: bison,
                debhelper (>= 9),
                dh-apparmor,
                dh-systemd,
-               dpatch,
                gdb,
                libaio-dev [linux-any],
                libboost-dev,

debian/rules

@@ -182,6 +182,6 @@ get-orig-source:
 # white list file only starting from Debian Stretch and Ubuntu Xenial.
 # To find more, grep build logs for 'but is not installed to anywhere'.
 %:
-	dh $@ --parallel --with dpatch --with systemd --list-missing
+	dh $@ --parallel --with systemd --list-missing
 
 # vim: ts=8

scripts/mysqld_safe.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
 # This file is public domain and comes with NO WARRANTY of any kind
 #