remove unnecessary code from GNU Hello

* src/hello.c: remove --next-generation print out format
* man/hello.x: remove --next-generation related BUG item
* Makefile.am: remove --next-generation tests
* tests/last-1: removal
* tests/multiline-box-1: removal

Karl Berry proposed the removal.
take care files missed none-recursive make commit 714f2a2

* .gitignore: ignore test-suite.log
* tests/Makefile.am: remove unnecessary file