Do not rely on bashisms and behaviour undefined by the POSIX specification.

By making lbmk fully POSIX-compliant, it will be easier to port lbmk to
other systems implementing POSIX such as Alpine Linux and FreeBSD.

Signed-off-by: Ferass 'Vitali64' EL HAFIDI <vitali64pmemail@protonmail.com>

resources/scripts/build/clean/cbutils

@@ -1,9 +1,9 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the dependencies that were built in coreboot
 #
 #	Copyright (C) 2014, 2015, 2016, 2020 Leah Rowe <info@minifree.org>
-#       Copyright (C) 2015 Klemens Nanni <contact@autoboot.org>
+#	Copyright (C) 2015 Klemens Nanni <contact@autoboot.org>
 #
 #    This program is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -38,7 +38,7 @@ for board in coreboot/*; do
     make -C "${board}/" distclean
 
 	# Clean its utilities as well
-	for util in {cbfs,ifd,nvram}tool cbmem; do
+	for util in cbfstool ifdtool nvramtool cbmem; do
 		make -C "${board}/util/${util}/" clean
 	done
 	make -C "${board}/payloads/libpayload/" distclean

resources/scripts/build/clean/crossgcc

@@ -1,9 +1,9 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the crossgcc builds
 #
 #	Copyright (C) 2014, 2015, 2016, 2020 Leah Rowe <info@minifree.org>
-#       Copyright (C) 2015 Klemens Nanni <contact@autoboot.org>
+#	Copyright (C) 2015 Klemens Nanni <contact@autoboot.org>
 #
 #    This program is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by

resources/scripts/build/clean/flashrom

@@ -1,9 +1,9 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the dependencies that were built in flashrom
 #
 #	Copyright (C) 2014, 2015 Leah Rowe <info@minifree.org>
-#       Copyright (C) 2015 Klemens Nanni <contact@autoboot.org>
+#	Copyright (C) 2015 Klemens Nanni <contact@autoboot.org>
 #
 #    This program is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by

resources/scripts/build/clean/grub

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the dependencies that were built in GRUB
 #

resources/scripts/build/clean/ich9utils

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the previous build of ich9utils
 #

resources/scripts/build/clean/memtest86plus

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the dependencies that were built in memtest86+
 #

resources/scripts/build/clean/payloads

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: nothing to see here, forks!
 #

resources/scripts/build/clean/rom_images

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: delete the ROM images
 #

resources/scripts/build/clean/seabios

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the dependencies that were built in seabios
 #

resources/scripts/build/clean/u-boot

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 #  helper script: clean the u-boot builds
 #