main/dhcp: use /bin/sh instead of bash in client-script

The script seems to be posix shell compatible so we only need to change
the shebang to #!/bin/sh

This way we avoid the bash dependency

main/dhcp/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=dhcp
 pkgver=4.4.1
 _realver=${pkgver/_p/-P}
-pkgrel=0
+pkgrel=1
 pkgdesc="ISC Dynamic Host Configuration Protocol (DHCP)"
 url="https://www.isc.org/"
 arch="all"
@@ -64,7 +64,6 @@ package() {
 
 dhclient() {
 	pkgdesc="ISC dhcp client"
-	depends="bash"
 	install -d -o dhcp -g dhcp "$subpkgdir"/var/lib/dhcp
 	install -d -o dhcp -g dhcp "$subpkgdir"/var/run/dhcp
 	install -d "$subpkgdir"/usr/sbin
@@ -89,7 +88,7 @@ dhcrelay() {
 }
 
 sha512sums="684ae349f224918c9f8cec7bd6c55cd0b83ad2b5827375b2876ca088eb05b7ff1364e50f6dc24f2485c610d9be94d4ba3020f60a0fa0ef63962349d191b887e7  dhcp-4.4.1.tar.gz
-940ba576f9bfb395712e92e59c338428fe30f61da0ea0394f8f677c568322106556281fbb4528a33db7a039963ff892b4d6239aff9377d64927acc26f446c1a6  dhclient-script-fix-bare-ip.patch
+65ddc66553f6f21184dd82baa929f2414b7374e9bafecc22f0d27a653f66796fbcb3a72d2f52af03a6993ce70e1b8dd0ab4fd630824b9a4825799bec190007fb  dhclient-script-fix-bare-ip.patch
 d5697a56fbbff25199962608986e7ffb533ed4afd3e344e3c79d2010dda73cc0b088f06c454e9f0c69eb054e09a374455fa71d3f73306e0c98fa76df4dd321b7  dhcp-3.0-fix-perms.patch
 0c3eee11ee9771a3bd7f8076827e57296136a36e6c00c3149e7274fb7a479feae4dc7d744f3c66ac78ffc96f036e14a7a5a0806095495441f98d76737a34faa6  dhcrelay.initd
 fd15dbaa4c61c3c26f407bf13dde859470a1adba134da064b653ccc152ce42635ee8de2fe113ae21ba8470e97e3caad8c1a47b69eb25e5e92b40e26790b96f6d  dhcrelay.confd

main/dhcp/dhclient-script-fix-bare-ip.patch

-diff -ur a/client/scripts/linux b/client/scripts/linux
---- a/client/scripts/linux	2017-07-25 09:39:54.000000000 -0400
-+++ b/client/scripts/linux	2018-01-23 08:17:42.569366100 -0500
-@@ -345,7 +345,7 @@
+diff --git a/client/scripts/linux b/client/scripts/linux
+index 0c42969..3214eb6 100755
+--- a/client/scripts/linux
++++ b/client/scripts/linux
+@@ -1,4 +1,4 @@
+-#!/bin/bash
++#!/bin/sh
+ # dhclient-script for Linux. Dan Halbert, March, 1997.
+ # Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
+ # No guarantees about this. I'm a novice at the details of Linux
+@@ -394,7 +394,7 @@ case "$reason" in
              make_resolv_conf
          else
              # flush all IPs from interface