man: Document that dpkg-buildpacakge -nc -S implies -d

debian/changelog

@@ -26,6 +26,7 @@ dpkg (1.18.4) UNRELEASED; urgency=low
       ‘-A’ option to the TERMS section. Closes: #799046
     - Clarify that the md5sum check on «dpkg --verify» is performed on the
       file contents, and failures denote changed content. Closes: #760248
+    - Document that dpkg-buildpacakge -nc -S implies -d.
 
   [ Updated programs translations ]
   * Dutch (Frans Spiesschaert). Closes: #800513

man/dpkg-buildpackage.1

@@ -219,9 +219,10 @@ These are the distribution specific implicit build dependencies usually
 required in a build environment, the so called Build-Essential package set.
 .TP
 .B \-nc
-Do not clean the source tree (implies \fB\-b\fP if nothing else has been
-selected among \fB\-F\fP, \fB\-g\fP, \fB\-G\fP, \fB\-B\fP, \fB\-A\fP
-or \fB\-S\fP).
+Do not clean the source tree.
+Implies \fB\-b\fP if nothing else has been selected among \fB\-F\fP,
+\fB\-g\fP, \fB\-G\fP, \fB\-B\fP, \fB\-A\fP or \fB\-S\fP.
+Implies \fB\-d\fP with \fB\-S\fP (since dpkg 1.18.0).
 .TP
 .B \-tc
 Clean the source tree (using