sdl_net: rename back to SDL_net

It turns out that renaming SDL_net to sdl_net (688c388ce765984af2) isn't
such a good idea, as the name is also used for the tarball filename to
download.

Instead go back to use SDL_net again, and simply add an sdl_net alias.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/games/prboom/prboom.mk

@@ -5,7 +5,7 @@
 #############################################################
 PRBOOM_VERSION:=2.4.7
 
-PRBOOM_DEPENDENCIES = sdl sdl_net sdl_mixer
+PRBOOM_DEPENDENCIES = sdl SDL_net sdl_mixer
 
 $(eval $(call AUTOTARGETS,package/games,prboom))
 

package/sdl_net/sdl_net.mk

@@ -14,4 +14,6 @@ SDL_NET_INSTALL_STAGING = YES
 
 SDL_NET_DEPENDENCIES = sdl
 
-$(eval $(call AUTOTARGETS,package,sdl_net))
+$(eval $(call AUTOTARGETS,package,SDL_net))
+
+sdl_net: SDL_net