Accepting request 186961 from home:jengelh:branches:games

- Some metadata spruce-up: add current URLs, softer wildcarding
  in the files list, more robust make install call
- Reduce build dependencies (xorg-x11-devel drew in a lot)
- Optional signature verification in local builds

OBS-URL: https://build.opensuse.org/request/show/186961
OBS-URL: https://build.opensuse.org/package/show/games/SDL2?expand=0&rev=14

SDL2.keyring

@@ -0,0 +1,28 @@
+pub   1024D/A7763BE6 2001-01-05
+uid                  Sam Lantinga <slouken@libsdl.org>
+sub   1024g/06F8768C 2001-01-05
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