system/FileDescriptor: no-op implementation of *CloseOnExec() on Windows

src/net/SocketDescriptor.hxx

@@ -90,11 +90,12 @@ public:
 		return SocketDescriptor(FileDescriptor::Undefined());
 	}
 
+	using FileDescriptor::EnableCloseOnExec;
+	using FileDescriptor::DisableCloseOnExec;
+
 #ifndef _WIN32
 	using FileDescriptor::SetNonBlocking;
 	using FileDescriptor::SetBlocking;
-	using FileDescriptor::EnableCloseOnExec;
-	using FileDescriptor::DisableCloseOnExec;
 	using FileDescriptor::Duplicate;
 	using FileDescriptor::Close;
 #else

src/system/FileDescriptor.hxx

@@ -115,7 +115,10 @@ public:
 
 	static bool CreatePipe(FileDescriptor &r, FileDescriptor &w) noexcept;
 
-#ifndef _WIN32
+#ifdef _WIN32
+	void EnableCloseOnExec() noexcept {}
+	void DisableCloseOnExec() noexcept {}
+#else
 	static bool CreatePipeNonBlock(FileDescriptor &r,
 				       FileDescriptor &w) noexcept;
 

src/system/UniqueFileDescriptor.hxx

@@ -97,14 +97,15 @@ public:
 
 	using FileDescriptor::SetNonBlocking;
 	using FileDescriptor::SetBlocking;
-	using FileDescriptor::EnableCloseOnExec;
-	using FileDescriptor::DisableCloseOnExec;
 	using FileDescriptor::Duplicate;
 	using FileDescriptor::CheckDuplicate;
 
 	static bool CreatePipe(FileDescriptor &r, FileDescriptor &w);
 #endif
 
+	using FileDescriptor::EnableCloseOnExec;
+	using FileDescriptor::DisableCloseOnExec;
+
 #ifdef USE_EVENTFD
 	using FileDescriptor::CreateEventFD;
 #endif