debian/rules: disable building with SDL integration

This was added once by accident, we do not really need it for Proxmox
VE, it could bring some value for testing but here one can build qemu
oneself too.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/rules

@@ -48,6 +48,7 @@ config.status: configure
 	--disable-guest-agent-msi \
 	--disable-libnfs \
 	--disable-libxml2 \
+	--disable-sdl \
 	--disable-smartcard \
 	--disable-strip \
 	--disable-xen \
@@ -60,7 +61,6 @@ config.status: configure
 	--enable-linux-aio \
 	--enable-numa \
 	--enable-rbd \
-	--enable-sdl \
 	--enable-seccomp \
 	--enable-spice \
 	--enable-usb-redir \