configure: build SDL if only SDL2 available
Right now if SDL2 is installed but not SDL1, default configure will entirely disable SDL. Check upfront for SDL2 using pkg-config, but still prefer SDL1 if both versions are installed. Signed-off-by: NCole Robinson <crobinso@redhat.com> Message-id: c9e570b5964d128a3595efe3170129a3da459776.1462557436.git.crobinso@redhat.com Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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