Use bash from PATH rather than hardcoded in /bin.

E.g. FreeBSD has bash in /usr/local.

http://code.google.com/p/phantomjs/issues/detail?id=597

build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 

deploy/package.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 # usage: just run this script (after having run build.sh)

src/qt/preconfig.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 COMPILE_JOBS=4
 

tools/crash-report.sh

@@ -1,3 +1,3 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 `dirname $0`/../src/breakpad/src/processor/minidump_stackwalk $1 `dirname $0`/../symbols

tools/dump-symbols.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Generates debugging symbols for breakpad. qt and phantomjs must have
 # been compiled in debug mode. So do:

tools/import-breakpad.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 svn export http://google-breakpad.googlecode.com/svn/trunk/ src/breakpad
 

tools/import-linenoise.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 LINENOISE_PATH="$PWD/../src/linenoise"
 LINENOISE_SRC_PATH="$LINENOISE_PATH/src"

tools/import-qt.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 QT_FOLDER=$PWD/../src/qt
 

tools/preconfig.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 COMPILE_JOBS=4