tools: use /usr/bin/env bash instead of /bin/bash

These commands fail on systems that do not have bash under /bin

Signed-off-by: William Casarin <jb55@jb55.com>

tools/check-includes.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 EXIT_CODE=0
 

tools/check-manpage.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 # Needs bash for process substitition, ie <(
 
 if [ $# != 2 ]; then

tools/check-markdown.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 if ! diff -u <(grep -E 'sudo apt-get install .*git' README.md) \
      <(grep -E 'sudo apt-get install .*git' doc/INSTALL.md); then

tools/check-setup_locale.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 EXIT_CODE=0
 for FILE in $(git grep -lE 'int main\(' | grep -vE '^ccan/'); do

tools/check-spelling.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 if git --no-pager grep -nHiE 'l[ightn]{6}g|l[ightn]{8}g|ilghtning|lgihtning|lihgtning|ligthning|lighnting|lightinng|lightnnig|lightnign' -- . ':!tools/check-spelling.sh'; then
     echo "Identified a likely misspelling of the word \"lightning\" (see above). Please fix."

tools/docker-entrypoint.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 : "${EXPOSE_TCP:=false}"
 

tools/mockup.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 if [ $# -eq 0 ]; then
     # With no args, read stdin to scrape compiler output.

tools/rel.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 from=${1}
 to=${2}

tools/update-mocks.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Script to rewrite the autogenerated mocks in a unit test between
 # /* AUTOGENERATED MOCKS START */ and /* AUTOGENERATED MOCKS END */
 # based on link failures.