Remaining OpenBSD changes.

* OpenBSD also needs `pthread_mutex_t?`.

* Originally I followed Darwin's check with `d_namlen`, but this should
  work too.

Author: 3405691582

Sources/FoundationEssentials/FileManager/FileOperations+Enumeration.swift

@@ -354,7 +354,8 @@ struct _POSIXDirectoryContentsSequence: Sequence {
                     continue
                 }
                 #endif
-                #if os(FreeBSD)
+
+                #if os(FreeBSD) || os(OpenBSD)
                 guard dent.pointee.d_fileno != 0 else {
                     continue
                 }
@@ -363,6 +364,7 @@ struct _POSIXDirectoryContentsSequence: Sequence {
                     continue
                 }
                 #endif
+
                 // Use name
                 let fileName: String
                 #if os(WASI)

Sources/FoundationEssentials/LockedState.swift

@@ -31,7 +31,7 @@ package struct LockedState<State> {
     private struct _Lock {
 #if canImport(os)
         typealias Primitive = os_unfair_lock
-#elseif os(FreeBSD)
+#elseif os(FreeBSD) || os(OpenBSD)
         typealias Primitive = pthread_mutex_t?
 #elseif canImport(Bionic) || canImport(Glibc) || canImport(Musl)
         typealias Primitive = pthread_mutex_t