stage2: tweak 99-cleanup-boot for efficiency

Thanks glebfm@ for noticing that Simply (an m-p-d product) takes no kernel inside squashfs but relies on livecd-install's 50-restore-kernel.sh hook to copy the kernel from iso9660 and regenerate initrd (which is a must anyways but requires System.map to be still around). This saves about 3 Mb in ISO size for a LiveCD using kernel-image-std-def-4.1.15-alt1.x86_64.rpm.

stage2: tweak 99-cleanup-boot for efficiency
37e77285 · Michael Shigorin · 837e6be9 · 37e77285
Commit 37e77285 authored Jan 12, 2016 by Michael Shigorin
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99-cleanup-boot sub.in/stage2/image-scripts.d/99-cleanup-boot +8 -3

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--- a/sub.in/stage2/image-scripts.d/99-cleanup-boot
+++ b/sub.in/stage2/image-scripts.d/99-cleanup-boot
 #!/bin/sh

 # don't cripple the image to be copied over
-[ -x /usr/sbin/live-install -o -x /usr/sbin/livecd-install -o \
-  -x /usr/sbin/homeros-install -o -x /usr/sbin/luwrain-install ] && exit 0
+# NB: livecd-install has 50-restore-kernel.sh
+[ -x /usr/sbin/live-install -o \
+  -x /usr/sbin/homeros-install -o \
+  -x /usr/sbin/luwrain-install ] && exit 0

 # no need for the kernel in live root otherwise: it's been booted already
-rm -f /boot/*
+# NB: installkernel run by that livecd-install hook needs System.map
+rm -f -- /boot/{initrd,vmlinuz}*
+
+[ -x /usr/sbin/livecd-install ] || rm -f -- /boot/*

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