Make all scripts portable regardless of where bash is installed.

scripts/build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # This script builds the application from source for multiple platforms.
 set -e

scripts/dist.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 # Get the parent directory of where this script is.

scripts/upload.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 # Get the parent directory of where this script is.

scripts/website_push.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Set the tmpdir
 if [ -z "$TMPDIR" ]; then