bindings-pkcs11: Fix potential overflow in C to OCaml functions.

  - C_GetSlotList
  - C_GetMechanismList
Merge branch 'master' of github.com:ANSSI-FR/caml-crush
Merge branch 'master' of github.com:ANSSI-FR/caml-crush
Merge branch 'master' of github.com:ANSSI-FR/caml-crush
C client: patch RPC timeout *only* when glibc is detected