libvncserver: make use of virtual/libsdl2

Signed-off-by: Markus Volk <f_l_k@t-online.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-graphics/libvncserver/libvncserver_0.9.14.bb

@@ -35,7 +35,7 @@ PACKAGECONFIG[png] = "-DWITH_PNG=ON,-DWITH_PNG=OFF,libpng,libpng"
 PACKAGECONFIG[pthread] = "-DWITH_THREADS=ON,-DWITH_THREADS=OFF,"
 PACKAGECONFIG[systemd] = "-DWITH_SYSTEMD=ON,-DWITH_SYSTEMD=OFF,systemd"
 PACKAGECONFIG[sasl] = "-DWITH_SASL=ON,-DWITH_SASL=OFF,cyrus-sasl"
-PACKAGECONFIG[sdl] = "-DWITH_SDL=ON,-DWITH_SDL=OFF,libsdl2"
+PACKAGECONFIG[sdl] = "-DWITH_SDL=ON,-DWITH_SDL=OFF,virtual/libsdl2"
 PACKAGECONFIG[websockets] = "-DWITH_WEBSOCKETS=ON,-DWITH_WEBSOCKETS=OFF,"
 PACKAGECONFIG[zlib] = "-DWITH_ZLIB=ON,-DWITH_ZLIB=OFF,zlib"