Update the OCSP_cert_to_id() signature for LibreSSL 2.8.1

While here, restore CI for LibreSSL 2.8.0 alongside 2.8.1 to account for the function signature change.

.circleci/config.yml

@@ -107,6 +107,9 @@ libressl_250: &LIBRESSL_250
   LIBRARY: libressl
   VERSION: 2.5.0
 libressl_270: &LIBRESSL_280
+  LIBRARY: libressl
+  VERSION: 2.8.0
+libressl_281: &LIBRESSL_281
   LIBRARY: libressl
   VERSION: 2.8.1
 
@@ -197,6 +200,10 @@ jobs:
     <<: *JOB
     environment:
       <<: [*LIBRESSL_280, *X86_64, *BASE]
+  x86_64-libressl-2.8.1:
+    <<: *JOB
+    environment:
+      <<: [*LIBRESSL_281, *X86_64, *BASE]
   macos:
     <<: *MACOS_JOB
     environment:
@@ -225,5 +232,6 @@ workflows:
     - armhf-openssl-1.0.2
     - x86_64-libressl-2.5.0
     - x86_64-libressl-2.8.0
+    - x86_64-libressl-2.8.1
     - macos
     - macos-vendored

openssl-sys/build/cfgs.rs

@@ -19,6 +19,9 @@ pub fn get(openssl_version: Option<u64>, libressl_version: Option<u64>) -> Vec<&
         if libressl_version >= 0x2_08_00_00_0 {
             cfgs.push("libressl280");
         }
+        if libressl_version >= 0x2_08_01_00_0 {
+            cfgs.push("libressl281");
+        }
     } else {
         let openssl_version = openssl_version.unwrap();
 

openssl-sys/src/ocsp.rs

@@ -45,7 +45,7 @@ pub const V_OCSP_CERTSTATUS_UNKNOWN: c_int = 2;
 pub enum OCSP_BASICRESP {}
 
 cfg_if! {
-    if #[cfg(ossl110)] {
+    if #[cfg(any(ossl110, libressl281))] {
         extern "C" {
             pub fn OCSP_cert_to_id(
                 dgst: *const EVP_MD,