ninvaders-0.1.1-bp156.4.6

- Set CFLAGS+=-fcommon to workaround gcc10 errors (boo#1160244)

- Rename binary from nInvaders to ninvaders
- Add patch:
  * ninvaders-obey-cflags.patch
- Convert inline changelog to ninvaders.changes
- Specfile cleanup

- Patch buffer owerflow that leads to an build error in Leap 15+

- initial release