local.conf.sample: update libsdl mentions to libsdl2

Qemu now builds with libsdl2, so update the local.conf.sample to reflect this.

(From meta-yocto rev: 5e187b5b3dc69f0e8e5a2956e7fe997e62cb48c9)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/local.conf.sample

@@ -234,12 +234,12 @@ BB_DISKMON_DIRS ??= "\
 # Qemu configuration
 #
 # By default qemu will build with a builtin VNC server where graphical output can be
-# seen. The two lines below enable the SDL backend too. By default libsdl-native will
+# seen. The two lines below enable the SDL backend too. By default libsdl2-native will
 # be built, if you want to use your host's libSDL instead of the minimal libsdl built
-# by libsdl-native then uncomment the ASSUME_PROVIDED line below.
+# by libsdl2-native then uncomment the ASSUME_PROVIDED line below.
 PACKAGECONFIG_append_pn-qemu-native = " sdl"
 PACKAGECONFIG_append_pn-nativesdk-qemu = " sdl"
-#ASSUME_PROVIDED += "libsdl-native"
+#ASSUME_PROVIDED += "libsdl2-native"
 
 # CONF_VERSION is increased each time build/conf/ changes incompatibly and is used to
 # track the version of this file when it was generated. This can safely be ignored if