Revert disabling of make in doc/ dir by default

This is a partial revert of commit d44e5099. By making disabling docs the
default, it presents all sorts of problems- namely anyone who builds from a
tarball and isn't careful enough to include '--enable-doc' will get an
install without any manpages at all. Remember that make includes both
'build' and 'install' steps.

The warning introduced by the commit is kept, so we do not lose all its
benefits, but I am not happy to see regressions introduced in packaging and
installing of this piece of software.

Signed-off-by: Dan McGee <dan@archlinux.org>

configure.ac

@@ -100,8 +100,8 @@ AC_ARG_ENABLE(internal-download,
 
 # Help line for documentation
 AC_ARG_ENABLE(doc,
-	AS_HELP_STRING([--enable-doc], [run make in doc/ dir]),
-	[wantdoc=$enableval], [wantdoc=no])
+	AS_HELP_STRING([--disable-doc], [prevent make from looking at doc/ dir]),
+	[wantdoc=$enableval], [wantdoc=yes])
 
 # Help line for doxygen
 AC_ARG_ENABLE(doxygen,
@@ -272,7 +272,7 @@ if test "x$wantdoc" = "xyes" ; then
 	fi
 	wantdoc=yes
 else
-	AC_MSG_RESULT([no])
+	AC_MSG_RESULT([no, disabled by configure])
 	wantdoc=no
 fi
 AM_CONDITIONAL(WANT_DOC, test "x$wantdoc" = "xyes")