xen-tools: Handle DOCS correctly

Reviewed by:	royger
Differential Revision:	https://reviews.freebsd.org/D30306

sysutils/xen-tools/pkg-plist

@@ -277,28 +277,28 @@ libdata/pkgconfig/xenstore.pc
 libdata/pkgconfig/xentoolcore.pc
 libdata/pkgconfig/xentoollog.pc
 libdata/pkgconfig/xlutil.pc
-man/man1/xenhypfs.1.gz
-man/man1/xenstore-chmod.1.gz
-man/man1/xenstore-ls.1.gz
-man/man1/xenstore-read.1.gz
-man/man1/xenstore-write.1.gz
-man/man1/xenstore.1.gz
-man/man1/xentop.1.gz
-man/man1/xentrace_format.1.gz
-man/man1/xl.1.gz
-man/man5/xl-disk-configuration.5.gz
-man/man5/xl-network-configuration.5.gz
-man/man5/xl-pci-configuration.5.gz
-man/man5/xl.cfg.5.gz
-man/man5/xl.conf.5.gz
-man/man5/xlcpupool.cfg.5.gz
-man/man7/xen-pci-device-reservations.7.gz
-man/man7/xen-pv-channel.7.gz
-man/man7/xen-tscmode.7.gz
-man/man7/xen-vtpm.7.gz
-man/man7/xen-vtpmmgr.7.gz
-man/man7/xl-numa-placement.7.gz
-man/man8/xentrace.8.gz
+%%DOCS%%man/man1/xenhypfs.1.gz
+%%DOCS%%man/man1/xenstore-chmod.1.gz
+%%DOCS%%man/man1/xenstore-ls.1.gz
+%%DOCS%%man/man1/xenstore-read.1.gz
+%%DOCS%%man/man1/xenstore-write.1.gz
+%%DOCS%%man/man1/xenstore.1.gz
+%%DOCS%%man/man1/xentop.1.gz
+%%DOCS%%man/man1/xentrace_format.1.gz
+%%DOCS%%man/man1/xl.1.gz
+%%DOCS%%man/man5/xl-disk-configuration.5.gz
+%%DOCS%%man/man5/xl-network-configuration.5.gz
+%%DOCS%%man/man5/xl-pci-configuration.5.gz
+%%DOCS%%man/man5/xl.cfg.5.gz
+%%DOCS%%man/man5/xl.conf.5.gz
+%%DOCS%%man/man5/xlcpupool.cfg.5.gz
+%%DOCS%%man/man7/xen-pci-device-reservations.7.gz
+%%DOCS%%man/man7/xen-pv-channel.7.gz
+%%DOCS%%man/man7/xen-tscmode.7.gz
+%%DOCS%%man/man7/xen-vtpm.7.gz
+%%DOCS%%man/man7/xen-vtpmmgr.7.gz
+%%DOCS%%man/man7/xl-numa-placement.7.gz
+%%DOCS%%man/man8/xentrace.8.gz
 sbin/flask-get-bool
 sbin/flask-getenforce
 sbin/flask-label-pci