printf.c: suppress warnings

* ext/-test-/printf/printf.c (printf_test_call): suppress
  maybe-uninitialized warnings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46246 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fileno.c: suppress warnings

* ext/-test-/dir/fileno.c (dir_check): suppress unused-function
  warnings, used only when dirfd() is available.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46247 b2dd03c8-39d4-4d8f-98ff-823fe69b080e