Add make tarxz-pkg build option

[Zdenek Kaspar <zkaspar82@gmail.com>]

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Hi! Most distributions use xz-utils already, is it possible to add
tarxz-pkg option ?

NB: If someone thinks xz -9 is a bit hardcore, it's not much different
like when bzip2 -9 was introduced into buildtar as an option imo..

TIA, Z.

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Signed-off-by: Zdenek Kaspar <zkaspar82@gmail.com>

--- a/scripts/package/Makefile	2011-01-28 23:05:03.000000000 +0100
+++ b/scripts/package/Makefile	2011-01-28 23:07:10.000000000 +0100
@@ -142,7 +142,9 @@
 	@echo '  tar-pkg             - Build the kernel as an uncompressed tarball'
 	@echo '  targz-pkg           - Build the kernel as a gzip compressed tarball'
 	@echo '  tarbz2-pkg          - Build the kernel as a bzip2 compressed tarball'
+	@echo '  tarxz-pkg           - Build the kernel as a xz compressed tarball'
 	@echo '  perf-tar-src-pkg    - Build $(perf-tar).tar source tarball'
 	@echo '  perf-targz-src-pkg  - Build $(perf-tar).tar.gz source tarball'
 	@echo '  perf-tarbz2-src-pkg - Build $(perf-tar).tar.bz2 source tarball'
+	@echo '  perf-tarxz-src-pkg  - Build $(perf-tar).tar.xz source tarball'
 
--- a/scripts/package/buildtar	2011-01-28 23:05:03.000000000 +0100
+++ b/scripts/package/buildtar	2011-01-28 23:08:20.000000000 +0100
@@ -35,6 +35,10 @@
 		compress="bzip2 -c9"
 		file_ext=".bz2"
 		;;
+	tarxz-pkg)
+		compress="xz -c9"
+		file_ext=".xz"
+		;;
 	*)
 		echo "Unknown tarball target \"${1}\" requested, please add it to ${0}." >&2
 		exit 1