lighdm: Rebuild to read bash init scripts

Change shebang of /usr/bin/lightdm-session from /bin/sh to
`/bin/bash --login`, so that the bash startup logic reads the
same init files as a login shell in a terminal window would do.
This is what users expect, so that, for example, applications
started from the desktop launcher have the same environment
and umask as applications started from a terminal window.

The scripts executed by the login shell include /etc/profile, so we
no longer need to call it explicitly.

lightdm.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION lightdm-1.28.0-0
+# BEE_VERSION lightdm-1.28.0-1
 
 SRCURL[0]="https://github.com/CanonicalLtd/lightdm/releases/download/${PKGVERSION}/lightdm-${PKGVERSION}.tar.xz"
 
@@ -46,7 +46,14 @@ mee_configure() {
 
 mee_install_post() {
 
-  sed '/bin\/sh/ a \\n. /etc/profile' ${S}/tests/src/lightdm-session > ${D}/usr/bin/lightdm-session
+  cat > ${D}/usr/bin/lightdm-session <<- 'EOF'
+	#! /bin/bash --login
+
+	# First argument is full command, ´for backwards compatibility'.
+
+	exec $1
+EOF
+
   chmod 755 ${D}/usr/bin/lightdm-session
   rm -rf ${D}/etc/init
   install -v -dm755 -o gdm -g gdm ${D}/var/lib/lightdm