rust/pv: Replace libc wherever possible

Replace all libc references to rust-std references if available.
This eliminates the need to include libc in the pv crate.
However, pv_base still refers to libc::ioctl and libc::ENOTTY.

Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

rust/pv/openssl_extensions/src/akid.rs

@@ -5,15 +5,15 @@
 use std::fmt;
 
 use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
-use libc::c_int;
 use openssl::x509::{X509CrlRef, X509Ref};
+use std::ffi::c_int;
 
 mod ffi {
     extern "C" {
         pub fn X509_check_akid(
             issuer: *const openssl_sys::X509,
             akid: *const openssl_sys::AUTHORITY_KEYID,
-        ) -> ::libc::c_int;
+        ) -> super::c_int;
     }
 }
 

rust/pv/openssl_extensions/src/crl.rs

@@ -30,7 +30,7 @@ mod ffi {
         pub fn X509_STORE_add_crl(
             xs: *mut openssl_sys::X509_STORE,
             x: *mut openssl_sys::X509_CRL,
-        ) -> libc::c_int;
+        ) -> std::ffi::c_int;
     }
 }
 

rust/pv/openssl_extensions/src/stackable_crl.rs

@@ -5,13 +5,13 @@
 use std::{marker::PhantomData, ptr};
 
 use foreign_types::{ForeignType, ForeignTypeRef};
-use libc::c_int;
 use openssl::{
     error::ErrorStack,
     stack::Stackable,
     x509::{X509Crl, X509CrlRef},
 };
 use openssl_sys::BIO_new_mem_buf;
+use std::ffi::c_int;
 
 pub struct StackableX509Crl(*mut openssl_sys::X509_CRL);