Fix the broken defaults for sound and cd plugins.

This has the side effect of defining defaults for all plugins, but as only
sound and cd actually use the defaults, no harm done.

config.d/build_control.m4

@@ -344,7 +344,6 @@ QF_PROCESS_NEED_LIBS(vid, [asm common gl glsl sdl sw sw32 svga x11])
 QF_PROCESS_NEED_LIBS(qw, [client common sdl server], a)
 QF_PROCESS_NEED_LIBS(nq, [client common sdl server], a)
 
-SND_OUTPUT_DEFAULT=""
 if test -n "$CL_TARGETS"; then
 	CD_TARGETS="libQFcd.la"
 	SND_TARGETS="libQFsound.la"
@@ -358,7 +357,6 @@ else
 	SND_TARGETS=""
 	AUDIO_TARGETS=""
 fi
-AC_DEFINE_UNQUOTED(SND_OUTPUT_DEFAULT, "$SND_OUTPUT_DEFAULT", [Define this to the default sound output driver.])
 
 if test "x$enable_shared" = xno; then
 	PREFER_PIC=

config.d/cdrom.m4

@@ -83,39 +83,6 @@ AC_ARG_WITH([cd-default],
 	AS_HELP_STRING([--with-cd-default=...],
 				   [Plugin to use for the default cd driver.]
 				   [Defaults to File.]
-				   [[File Linux XMMS SDL SGI WIN32]]), 
+				   [[file linux xmms sdl sgi win32]]),
-	cd_default="$withval", cd_default=File
+	[cd_default="$withval"]
 )
-CD_DEFAULT=""
-if test "x$cd_default" != "x"; then
-	for cdd in $CDTYPE; do
-		if test "x$cdd" = "x$cd_default"; then
-			CD_DEFAULT="$cd_default"
-		fi
-	done
-fi
-case "x$CD_DEFAULT" in
-	xFile)
-		CD_DEFAULT=file
-		;;
-	xLinux)
-		CD_DEFAULT=linux
-		;;
-	xXMMS)
-		CD_DEFAULT=xmms
-		;;
-	xSDL)
-		CD_DEFAULT=sdl
-		;;
-	xSGI)
-		CD_DEFAULT=sgi
-		;;
-	xWIN32)
-		CD_DEFAULT=win
-		;;
-	x*)
-		AC_MSG_WARN([Unknown or unbuildable cd plugin])
-		CD_DEFAULT=file
-		;;
-esac
-AC_DEFINE_UNQUOTED(CD_DEFAULT, ["$CD_DEFAULT"], [Define to the default CD plugin])

config.d/result.m4

@@ -5,8 +5,8 @@ AC_MSG_RESULT([
 	Server support     :${SV_TARGETS:- no}
 	Client support     :${CL_TARGETS:- no}
 	Tools support      :${tools_dirs:- no}
-	Sound support      :${SOUND_TYPES:- no} ${SND_OUTPUT_DEFAULT}
+	Sound support      :${SOUND_TYPES:- no} ${snd_output_default}
-	CD Audio system    :${CDTYPE:- no} ${CD_DEFAULT}
+	CD Audio system    :${CDTYPE:- no} ${cd_default}
 	IPv6 networking    : $NETTYPE_IPV6
 	Compression support: gz=$HAVE_ZLIB ogg=$HAVE_VORBIS flac=$HAVE_FLAC png=$HAVE_PNG
 	HTTP support       : ${CURL:-no}

m4/quakeforge.m4

@@ -96,6 +96,13 @@ AC_DEFUN([QF_PROCESS_NEED_subroutine],
 fi
 ])])
 
+AC_DEFUN([QF_PROCESS_NEED_FUNC],
+[m4_foreach_w([qfn_need], [$2],
+[if test x"${$1[_need_]qfn_need}" = xyes; then
+	$3
+fi
+])])
+
 AC_DEFUN([QF_PROCESS_NEED_LIBS],
 [m4_define([qfn_ext], m4_default($3,[la]))
 QF_PROCESS_NEED_subroutine([lib$1_],[$1],[.]qfn_ext,[$1_libs],[$2])
@@ -108,6 +115,11 @@ AC_SUBST([$1_dirs])])
 AC_DEFUN([QF_PROCESS_NEED_PLUGINS],
 [QF_PROCESS_NEED_subroutine([$1_],[$1],[.la],[$1_plugins],[$2])
 AC_SUBST([$1_plugins])
+m4_define([qfn_default], m4_default($3,$1)[_default])
+if test -z "${qfn_default}"; then
+	QF_PROCESS_NEED_FUNC([$1],[$2],[qfn_default=qfn_need])
+fi
+AC_DEFINE_UNQUOTED(m4_toupper(qfn_default), [${qfn_default}], [Define to default the $1 plugin])
 AC_DEFINE_UNQUOTED(m4_toupper(m4_default($3,$1)[_plugin_protos]), [], [list of $1 plugin prototypes])
 AC_DEFINE_UNQUOTED(m4_toupper(m4_default($3,$1)[_plugin_list]), [], [list of $1 plugins])
 ])
@@ -136,13 +148,6 @@ QF_STATIC_PLUGIN_LIBS(m4_default($4,$1),[$1],[$2],[$3])
 QF_STATIC_PLUGIN_PROTOS(m4_default($4,$1),[$1],[$2])
 QF_STATIC_PLUGIN_LIST(m4_default($4,$1),[$1],[$2])])
 
-AC_DEFUN([QF_PROCESS_NEED_FUNC],
-[m4_foreach_w([qfn_need], [$2],
-[if test x"${$1[_need_]qfn_need}" = xyes; then
-	$3
-fi
-])])
-
 AC_DEFUN([QF_WITH_TARGETS], [
 AC_ARG_WITH($1,
 	[$2]