Clone data files from sparc for sparc64.

Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>

data/stretch/sparc64/debian.txt

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+
+                  Welcome to Debian GNU/Linux ${DEBIAN_VERSION}!
+
+This is a Debian installation ${MEDIA_TYPE}, built on ${BUILD_DATE}.
+Keep it once you have installed your system, as you can boot from it
+to repair the system on your hard disk if that ever becomes necessary.
+
+WARNING: You should completely back up all of your hard disks before
+  proceeding. The installation procedure can completely and irreversibly
+  erase them! If you haven't made backups yet, remove the rescue CD from
+  the drive and press L1-A to get back to the OpenBoot prompt.
+
+Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted
+by applicable law.
+
+[ ENTER - Boot install ]   [ Type "expert" - Boot into expert mode ]
+                           [ Type "rescue" - Boot into rescue mode ]

data/stretch/sparc64/notsupported.txt

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+
+This subarchitecture is currently not supported by Debian.
+Only 64-bit systems are supported (sparc64).
+
+The last Debian release to support sparc32 (sun4m) was Etch (4.0).

data/stretch/sparc64/silo.conf

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+partition=1
+timeout=600
+message=/boot/debian.txt
+default=install
+
+### sparc64 boot images
+image[sun4u]=/boot/sparc64
+   label=install
+   initrd=/boot/initrd.gz
+image[sun4,sun4c,sun4d,sun4m]="cat /boot/notsupported.txt"
+   label=install
+
+# sparc64 expert boots
+image[sun4u]=/boot/sparc64
+   label=expert
+   initrd=/boot/initrd.gz
+   append="debconf/priority=low"
+image[sun4,sun4c,sun4d,sun4m]="cat /boot/notsupported.txt"
+   label=expert
+
+# sparc64 rescue boots
+image[sun4u]=/boot/sparc64
+   label=rescue
+   initrd=/boot/initrd.gz
+   append="rescue/enable=true"
+image[sun4,sun4c,sun4d,sun4m]="cat /boot/notsupported.txt"
+   label=rescue
+
+# sparc64 auto-install boots
+image[sun4u]=/boot/sparc64
+   label=auto
+   initrd=/boot/initrd.gz
+   append="auto=true priority=critical"
+image[sun4,sun4c,sun4d,sun4m]="cat /boot/notsupported.txt"
+   label=auto

data/stretch/sparc64_businesscard_udeb_include

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+choose-mirror
+netcfg
+ethdetect

data/stretch/sparc64_netinst_udeb_include

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+netcfg
+ethdetect

data/stretch/sparc64_udeb_include

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+netcfg
+ethdetect