scripts: remove hardcoding of bash hashbang

For host systems like FreeBSD, bash binary is found in a different path.

boards/arduino-mega2560/dist/debug.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 sleep 2
 setsid -w avarice $1 &
 #sleep 2 && $2/avr-gdb-wrapper -ex "target remote localhost:$3" $4

boards/arduino-mega2560/dist/debug_srv.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 sleep 2
 avarice $1

boards/msba2-common/tools/flashutil.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#/usr/bin/env bash
 
 linux_checkid() {
     udevinfo -a -n ${1} | grep -q "ATTRS{product}==\"${2}\""

boards/pttu/tools/openocd-pttu.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#/usr/bin/env bash
 
 if [ $# -le 0 ]; then
     echo "usage: $0 [openocd interface name] [openocd args]" >&2

boards/x86-multiboot-common/dist/link

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 args=($@)
 

dist/tools/drone-scripts/build_and_test.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright (C) 2015 Eistec AB
 #
 # This file is subject to the terms and conditions of the GNU Lesser General

dist/tools/eclipsesym/cmdline2xml.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright (C) 2015 Eistec AB
 #

dist/tools/pr_check/check_labels.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 #
 # Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
 #

dist/tools/pr_check/pr_check.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 #
 # Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
 #

dist/tools/testsuite/build_and_generate_html.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 test -f ~/.buildbot && . ~/.buildbot
 

dist/tools/testsuite/generate_html.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 ROOT=${ROOT:-.}
 TOOLROOT=${TOOLROOT:-${ROOT}}

dist/tools/testsuite/parse_buildlog.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 LOG=${1}
 

dist/tools/testsuite/run_tests.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 TOOLROOT=${TOOLROOT:-.}
 

dist/tools/toolchains/build_gnuarm.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # directory to install compiled binaries into
 PREFIX=${HOME}/gnuarm

dist/tools/toolchains/build_gnuarm_naked.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # directory to install compiled binaries into
 PREFIX=${HOME}/gnuarm-naked

dist/tools/toolchains/build_x86.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # directory to download source files and store intermediates
 [[ -z $TARGET ]] && TARGET=i586-none-elf

dist/tools/travis-scripts/build_and_test.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Copyright (C) 2015 Philipp Rosenkranz <philipp.rosenkranz@fu-berlin.de>
 #

dist/tools/usb-serial/find-tty.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # Copyright (C) 2015 Eistec AB

pkg/libfixmath/checkout.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 if [ -z "${CHECKOUT_FOLDER}" ]; then
     echo 'export CHECKOUT_FOLDER before running this script' >&2

pkg/libfixmath/perform-svn-checkout.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 if [ -z "${PKG_URL}" ]; then
     echo 'export PKG_URL before running this script' >&2
     exit 2