scripts: Do not hard-code /bin/bash.

Instead, use Bash from PATH.  This approach works universally, even in
environments not strictly adhering to the File Hierarchy
Standard (FHS).

Change-Id: I852c5f4bba3a1bee9b895dcb5da24e5738c4186a

autogen.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 AUTORECONF=`which autoreconf`
 if test -z $AUTORECONF; then

bin/jni/make-swig.sh

-#!/bin/bash -
+#!/usr/bin/env bash
 #
 #  Copyright (C) 2004-2021 Savoir-faire Linux Inc.
 #

contrib/src/ffmpeg/windows-configure-make.sh

-#!/bin/bash
+#!/usr/bin/env bash
 set +x
 set +e
 DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
@@ -200,4 +200,4 @@ set -x
 set -e
 ../../../configure $FFMPEGCONF --extra-cflags="${EXTRACFLAGS}" --extra-ldflags="${EXTRALDFLAGS}" --prefix="${PREFIX}"
 make -j8 install
-cd ../../..
\ No newline at end of file
+cd ../../..

tools/update-copyright

-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (C) 2004-2021 Savoir-faire Linux Inc.
 #