scripts: Get Bash from /usr/bin/env (#647)

Not all *Nix systems have Bash located at /bin/bash, this fixes building Vita3k
on them.

.travis/linux/build.sh

@@ -1,3 +1,4 @@
-#!/bin/bash -ex
+#!/usr/bin/env bash
+set -ex
 
-docker run -v $(pwd):/Vita3K -v "$HOME/.ccache":/root/.ccache gcc:8 /bin/bash -ex /Vita3K/.travis/linux/docker.sh || exit $?
+docker run -v $(pwd):/Vita3K -v "$HOME/.ccache":/root/.ccache gcc:8 /usr/bin/env bash -ex /Vita3K/.travis/linux/docker.sh || exit $?

external/unicorn-build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 
 UNICORN_ARCHS=arm UNICORN_DEBUG=no UNICORN_SHARED=no ./make.sh

format.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 set -ex
 
 find vita3k tools/gen-modules tools/native-tool \( -name *.cpp -o -name *.h \) | xargs clang-format -i

gen-linux.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -ex
 
 # CI uses pre-built Boost

gen-macos.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 set -ex
 
 BOOST_FOUND="$(cmake --find-package -DNAME=Boost -DCOMPILER_ID=GNU -DLANGUAGE=C -DMODE=EXIST)"