Revert "opencv: cleanup depends and comments"

This reverts commit 5f7cbb264ec21f75320ad8518d27f4c605c825f8.

Buildroot policy is to keep the dependencies / comments for sub options in
case the package in the future no longer has those dependencies.

See http://lists.busybox.net/pipermail/buildroot/2014-February/088523.html
for details.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/opencv/Config.in

@@ -140,13 +140,20 @@ comment "ffmpeg support needs a toolchain w/ largefile, IPv6"
 
 config BR2_PACKAGE_OPENCV_WITH_GSTREAMER
 	bool "gstreamer support"
+	depends on BR2_USE_WCHAR # gstreamer -> libglib2
+	depends on BR2_TOOLCHAIN_HAS_THREADS # gstreamer -> libglib2
 	select BR2_PACKAGE_GSTREAMER
 	select BR2_PACKAGE_GST_PLUGINS_BASE
 	select BR2_PACKAGE_GST_PLUGINS_BASE_PLUGIN_APP
 
+comment "gstreamer support needs a toolchain w/ wchar, threads"
+	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
+
 config BR2_PACKAGE_OPENCV_WITH_GTK
 	bool "gtk support"
 	depends on BR2_PACKAGE_XORG7
+	depends on BR2_USE_WCHAR # libgtk2 -> libglib2
+	depends on BR2_TOOLCHAIN_HAS_THREADS # libgtk2 -> libglib2
 	depends on BR2_INSTALL_LIBSTDCPP
 	select BR2_PACKAGE_LIBGTK2
 
@@ -181,12 +188,13 @@ config BR2_PACKAGE_OPENCV_WITH_TIFF
 config BR2_PACKAGE_OPENCV_WITH_V4L
 	bool "v4l support"
 	depends on BR2_LARGEFILE
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_LIBV4L
 	help
 	  Enable Video 4 Linux support.
 
-comment "v4l support needs a toolchain w/ largefile"
-	depends on !BR2_LARGEFILE
+comment "v4l support needs a toolchain w/ largefile, threads"
+	depends on !BR2_LARGEFILE || !BR2_TOOLCHAIN_HAS_THREADS
 
 comment "Install options"