pkg/51917: Add documentation of the LICENSE variable to the pkgsrc guide's components chapter

[dhgutteridge%sympatico.ca@localhost]

>Number:         51917
>Category:       pkg
>Synopsis:       Add documentation of the LICENSE variable to the pkgsrc guide's components chapter
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 25 19:40:00 +0000 2017
>Originator:     David H. Gutteridge
>Release:        current
>Organization:
>Environment:
n/a
>Description:
LICENSE isn't among the variables documented in section 11.1
"Makefile". It probably should be, so here's a small patch to add it,
with a cross-reference to a later section where more details are
provided.

>How-To-Repeat:

>Fix:
--- components.xml.orig
+++ components.xml
@@ -116,6 +116,11 @@
     <listitem><para><varname>COMMENT</varname> is a one-line
     description of the package (should not include the package
     name).</para></listitem>
+
+    <listitem><para><varname>LICENSE</varname> indicates the license(s)
+    applicable for the package. See <xref
+    linkend="fixes.handling-licenses"/> for further details.</para>
+    </listitem>
   </itemizedlist></para>
 
   <para>Other variables that affect the build: