lib/distro.mk: don't do localboot by default

distro/.base target used to pull in localboot syslinux config
snippet which might be too early for some of the further distros;
it's a quite fragile equilibrium which was shifted a bit by imz@
(see #26606).  Feel free to reopen the discussion though, things
might be tweaked so that localboot might be desirable on almost
every image even if with lower priority...

conf.d/live.mk

@@ -7,7 +7,7 @@ distro/dos: distro/.init use/dos use/syslinux/ui-menu
 
 distro/live-systemd: distro/.base use/live/base use/systemd
 
-distro/live-install: distro/.base use/live/install
+distro/live-install: distro/.base use/live/install use/syslinux/localboot.cfg
 
 distro/live-isomd5sum: distro/.base use/live/base use/isomd5sum
 	@$(call add,LIVE_PACKAGES,livecd-isomd5sum)

conf.d/server.mk

@@ -30,7 +30,7 @@ distro/server-ovz: distro/server-mini \
 
 # tiny network-only server-ovz installer (stage2 comes over net too)
 distro/server-ovz-netinst: distro/.base sub/stage1 use/stage2 \
-	use/syslinux/ui-menu use/memtest
+	use/syslinux/ui-menu use/syslinux/localboot.cfg use/memtest
 	@$(call add,SYSLINUX_CFG,netinstall2)
 
 endif

lib/distro.mk

@@ -20,7 +20,7 @@ distro/.init: profile/bare
 
 # NB: the last flavour in KFLAVOURS gets to be the default one;
 # the kernel packages regexp evaluation has to take place at build stage
-distro/.base: distro/.init use/syslinux/localboot.cfg
+distro/.base: distro/.init
 	@$(call set,KFLAVOURS,std-def)
 
 # bootloader test target
@@ -30,7 +30,7 @@ distro/syslinux: distro/.init \
 
 # something marginally useful (as a network-only installer)
 # NB: doesn't carry stage3 thus cannot use/bootloader
-distro/installer: distro/.base use/install2
+distro/installer: distro/.base use/install2 use/syslinux/localboot.cfg
 	@$(call set,INSTALLER,altlinux-generic)
 	@$(call set,STAGE1_KMODULES_REGEXP,drm.*)	# for KMS