xeyes: upgrade 1.2.0 -> 1.3.0

Use the sha256sum for the .xz archive instead of .bz2 because of
upstream commit bdd57f3. Add SRC_URI_EXT to match.

Changelog:

637b948 (HEAD -> master, tag: xeyes-1.3.0, origin/master, origin/HEAD) xeyes 1.3.0
6f6c975 Implement multi-ocular support, add biblical example
f30ef4e Print which argument was unknown before giving usage message
e7a54da Add -help & -version options
e38962e gitlab CI: stop requiring Signed-off-by in commits
c060e6d man page: remove out-of-date reference to X(7)
ebbd57a Fix spelling/wording issues
bdd57f3 Build xz tarballs instead of bzip2
700a551 gitlab CI: add a basic build test

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>