add support for building sphinx documentation

lib/samples/Makefile.in

@@ -55,12 +55,6 @@ SRCS =		resolve.c \
 		sample-async.c sample-gai.c sample-update.c \
 		sample-request.c nsprobe.c
 
-MANPAGES =
-
-HTMLPAGES =
-
-MANOBJS =	${MANPAGES} ${HTMLPAGES}
-
 @BIND9_MAKE_RULES@
 
 resolve@EXEEXT@: resolve.@O@ ${IRSDEPLIBS} ${DEPLIBS}
@@ -87,11 +81,6 @@ nsprobe@EXEEXT@: nsprobe.@O@ ${DEPLIBS}
 	${LIBTOOL_MODE_LINK} ${PURIFY} ${CC} ${CFLAGS} ${LDFLAGS} -o $@ \
 	nsprobe.@O@ ${LIBS}
 
-doc man:: ${MANOBJS}
-
-docclean manclean maintainer-clean::
-	rm -f ${MANOBJS}
-
 clean distclean maintainer-clean::
 	rm -f ${TARGETS}
 	rm -f sample.key