xscreensaver: add missing indirect dependency on atomics

Also reformat the comment lines and fix the comment.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/xscreensaver/Config.in

@@ -1,10 +1,11 @@
 config BR2_PACKAGE_XSCREENSAVER
 	bool "xscreensaver"
 	depends on BR2_PACKAGE_XORG7
-	depends on BR2_INSTALL_LIBSTDCPP # libgtk2->pango
-	depends on BR2_TOOLCHAIN_HAS_THREADS # libgtk2->glib2
-	depends on BR2_USE_WCHAR # libgtk2->glib2
-	depends on BR2_USE_MMU # libgtk2->glib2
+	depends on BR2_INSTALL_LIBSTDCPP # libgtk2 -> pango
+	depends on BR2_TOOLCHAIN_HAS_THREADS # libgtk2 -> glib2
+	depends on BR2_USE_WCHAR # libgtk2 -> glib2
+	depends on BR2_USE_MMU # libgtk2 -> glib2
+	depends on BR2_ARCH_HAS_ATOMICS # libgtk2 -> cairo
 	select BR2_PACKAGE_LIBGTK2
 	select BR2_PACKAGE_LIBGLADE
 	select BR2_PACKAGE_JPEG
@@ -24,4 +25,6 @@ config BR2_PACKAGE_XSCREENSAVER
 comment "xscreensaver needs a toolchain w/ wchar, C++, threads"
 	depends on BR2_PACKAGE_XORG7
 	depends on BR2_USE_MMU
-	depends on !(BR2_INSTALL_LIBSTDCPP && BR2_TOOLCHAIN_HAS_THREADS)
+	depends on BR2_ARCH_HAS_ATOMICS
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || \
+		!BR2_USE_WCHAR