make cgo dependencies venodr-able

Author: brinkpku

libde265/extra/vendorkeep.go

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+//go:build vendorkeep
+// +build vendorkeep
+
+package cgowrapper

libde265/include_cgo.go

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+//go:build vendorkeep
+// +build vendorkeep
+
+package libde265
+
+// https://github.com/golang/go/issues/26366
+
+// This file exists purely to prevent the golang toolchain from stripping
+// away the c source directories and files when `go mod vendor` is used
+// to populate a `vendor/` directory of a project depending on `goheif`.
+//
+// How it works:
+//  - every directory which only includes c/c++ source files receives a
+//    vendorkeep.go file.
+//  - every directory we want to preserve is included here as a _ import.
+//  - every dummy go file is given a build tag to exclude it from the regular
+//    build.
+
+import (
+	// Prevent go tooling from stripping out the c source files.
+	_ "github.com/jdeng/goheif/libde265/extra"
+	_ "github.com/jdeng/goheif/libde265/libde265"
+	_ "github.com/jdeng/goheif/libde265/libde265/arm"
+	_ "github.com/jdeng/goheif/libde265/libde265/x86"
+)

libde265/libde265/arm/vendorkeep.go

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+//go:build vendorkeep
+// +build vendorkeep
+
+package cgowrapper

libde265/libde265/vendorkeep.go

@@ -0,0 +1,4 @@
+//go:build vendorkeep
+// +build vendorkeep
+
+package cgowrapper

libde265/libde265/x86/vendorkeep.go

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+//go:build vendorkeep
+// +build vendorkeep
+
+package cgowrapper