Specs for Hash when key has private hash method
Spec Kernel#lambda passing a Proc with &
Fix typos in proc specs
Fix coding style for :shared
Add specs for rb_sprintf
Quarantine specs for NULL bytes and String#crypt

Looks like newer versions of Glibc started throwing errors for this. The
behavior therefore isn't consistent on Linux.

Fixes #2168
Added specs for rb_obj_instance_variables
Fixed Process.getrlimit specs.
Fixed Process.setrlimit specs.