Add dlopen stub for other platforms

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>

dlopen/dlopen_incompatible.go

@@ -0,0 +1,40 @@
+// Copyright 2016 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !cgo !linux
+package dlopen
+
+import (
+	"errors"
+	"unsafe"
+)
+
+var errIncompatible = errors.New("package dlopen is incompatible with this platform")
+
+type LibHandle struct {
+	Handle  unsafe.Pointer
+	Libname string
+}
+
+func GetHandle(libs []string) (*LibHandle, error) {
+	return nil, errIncompatible
+}
+
+func (l *LibHandle) GetSymbolPointer(symbol string) (unsafe.Pointer, error) {
+	return nil, errIncompatible
+}
+
+func (l *LibHandle) Close() error {
+	return errIncompatible
+}