test: remove test 580

Test 580 is removed again for two reasons:

1) Some compilers aren't satisfied by just a data variable called 'test'
when first.o wants a function called 'test'. The Solaris compiler says
"ld: warning: symbol `test' has differing types:" while the AIX compiler
downright rejects it.

2) Test case 1119 that was added after this test is way more complete
and cover everything test 580 does and more without introducing the same
problems.

tests/libtest/.gitignore

@@ -1,3 +1,3 @@
 chkhostname
 lib5[0-9][0-9]
-lib580.c
+