support: replace /bin/bash with /bin/sh for FreeBSD - fixes issue#2192

support/changelog

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Create the Tvheadend changelog
 #

support/configure.inc

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Generic/Simple configure script
 #

support/getmuxlist

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Fetch DVB scan files
 #

support/tarball

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Build tarball of the current directory
 #

support/version

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Update Tvheadend version file (if required)
 #