pulseaudio: uses fork(), not available on noMMU platforms

Even though pulseaudio has some HAVE_FORK compile-time conditionals to
avoid using fork(), those parts of pulseaudio are not using it. Since
using pulseaudio on !MMU platforms is fairly unlikely, we simply
disable it when no MMU is available, and propagate this dependency to
the appropriate locations.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gstreamer/gst-plugins-good/Config.in

@@ -207,6 +207,7 @@ config BR2_PACKAGE_GST_PLUGINS_GOOD_PLUGIN_OSS4
 config BR2_PACKAGE_GST_PLUGINS_GOOD_PLUGIN_PULSE
 	depends on BR2_TOOLCHAIN_HAS_THREADS # pulseaudio
 	depends on BR2_LARGEFILE # pulseaudio -> libsndfile
+	depends on BR2_USE_MMU # pulseaudio
 	select BR2_PACKAGE_PULSEAUDIO
 	bool "pulseaudio"
 

package/gstreamer1/gst1-plugins-good/Config.in

@@ -303,6 +303,7 @@ comment "gdkpixbuf needs a toolchain w/ wchar, threads"
 config BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_PULSE
 	depends on BR2_TOOLCHAIN_HAS_THREADS # pulseaudio
 	depends on BR2_LARGEFILE # pulseaudio -> libsndfile
+	depends on BR2_USE_MMU # pulseaudio
 	select BR2_PACKAGE_PULSEAUDIO
 	bool "pulseaudio"
 	help

package/mpd/Config.in

@@ -48,6 +48,7 @@ config BR2_PACKAGE_MPD_PULSEAUDIO
 	bool "pulseaudio"
 	depends on BR2_TOOLCHAIN_HAS_THREADS # pulseaudio
 	depends on BR2_LARGEFILE # pulseaudio -> libsndfile
+	depends on BR2_USE_MMU # pulseaudio
 	select BR2_PACKAGE_PULSEAUDIO
 	help
 	  Enable pulseaudio output support.

package/pulseaudio/Config.in

@@ -7,6 +7,7 @@ config BR2_PACKAGE_PULSEAUDIO
 	select BR2_PACKAGE_LIBSNDFILE
 	select BR2_PACKAGE_SPEEX
 	depends on BR2_LARGEFILE
+	depends on BR2_USE_MMU # fork()
 	help
 	  PulseAudio is a sound system for POSIX OSes, meaning that it
 	  is a proxy for your sound applications. It allows you to do
@@ -30,4 +31,5 @@ config BR2_PACKAGE_PULSEAUDIO_DAEMON
 endif
 
 comment "pulseaudio needs a toolchain w/ wchar, largefile, threads"
+	depends on BR2_USE_MMU
 	depends on !BR2_USE_WCHAR || !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS