packages: Rename liblzma package to xz

Rename liblzma to xz, and use LIB_PACKAGE to create an xz-lib package
for runtime libraries.

MFC after:	1 day
Reviewed by:	bapt
Sponsored by:	https://www.patreon.com/bsdivy
Differential Revision:	https://reviews.freebsd.org/D52791

lib/liblzma/Makefile

@@ -1,4 +1,6 @@
-PACKAGE=lib${LIB}
+PACKAGE=	xz
+LIB_PACKAGE=
+
 LIB=		lzma
 LZMADIR=	${SRCTOP}/contrib/xz/src/liblzma
 

release/packages/ucl/xz-all.ucl

@@ -16,11 +16,12 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-comment = "XZ LZMA library"
+comment = "LZMA2 data compression"
 
 desc = <<EOD
-liblzma allows applications to compress and decompress data using the XZ
-compression algorithm.
+xz compresses data using the LZMA2 data compression algorithm.  This package
+provides the front-end xz(1) utility, and the liblzma library which allows
+applications to use this functionality programatically.
 EOD
 
 annotations {

usr.bin/lzmainfo/Makefile

@@ -1,3 +1,5 @@
+PACKAGE=xz
+
 PROG=	lzmainfo
 
 XZDIR=	${SRCTOP}/contrib/xz/src

usr.bin/xz/Makefile

@@ -1,5 +1,7 @@
 .include <src.opts.mk>
 
+PACKAGE=xz
+
 PROG=	xz
 
 LINKS=	${BINDIR}/xz ${BINDIR}/unxz

usr.bin/xzdec/Makefile

@@ -1,3 +1,5 @@
+PACKAGE=xz
+
 PROG=	xzdec
 
 LINKS=	${BINDIR}/xzdec ${BINDIR}/lzdec