Add missing public header for libpki

Some CLs crossed in-flight.

Change-Id: Id98cfb7c5af67275b99df627534a633f9ae3d14a
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/67587
Reviewed-by: Adam Langley <agl@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
diff --git a/build.json b/build.json
index bc994b6..a431f6a 100644
--- a/build.json
+++ b/build.json
@@ -605,7 +605,8 @@
         ],
         "hdrs": [
             "include/openssl/pki/certificate.h",
-            "include/openssl/pki/signature_verify_cache.h"
+            "include/openssl/pki/signature_verify_cache.h",
+            "include/openssl/pki/verify_error.h"
         ],
         "internal_hdrs": [
             "pki/cert_error_id.h",
diff --git a/gen/sources.cmake b/gen/sources.cmake
index 7c468ba..927363d 100644
--- a/gen/sources.cmake
+++ b/gen/sources.cmake
@@ -1093,6 +1093,7 @@
 
   include/openssl/pki/certificate.h
   include/openssl/pki/signature_verify_cache.h
+  include/openssl/pki/verify_error.h
 )
 
 set(
diff --git a/gen/sources.json b/gen/sources.json
index 0568057..1fe6517 100644
--- a/gen/sources.json
+++ b/gen/sources.json
@@ -1040,7 +1040,8 @@
     ],
     "hdrs": [
       "include/openssl/pki/certificate.h",
-      "include/openssl/pki/signature_verify_cache.h"
+      "include/openssl/pki/signature_verify_cache.h",
+      "include/openssl/pki/verify_error.h"
     ],
     "internal_hdrs": [
       "pki/cert_error_id.h",