support envoy-wasm's release/v1.15.0 branch with 'abi_0_1_0' tag

Signed-off-by: mathetake <[email protected]>

Author: mathetake

README.md

@@ -55,7 +55,7 @@ TinyGo's official release of WASI target will come soon, and after that you coul
 | proxy-wasm-go-sdk| proxy-wasm ABI version |istio/proxyv2|
 |:-------------:|:-------------:|:-------------:|
 | main |  0.2.0|   v1.17.x |
-| v0.0.7 |  0.2.0|   v1.17.x |
+| v0.0.8 |  0.2.0|   v1.17.x |
 
 
 ## run examples

proxywasm/abi_version.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// +build !abi_0_1_0
+
 package proxywasm
 
 //nolint

proxywasm/abi_version_010.go

@@ -0,0 +1,24 @@
+// Copyright 2020 Tetrate
+//
+// 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 abi_0_1_0
+
+// This ABI version switching is necessary to be compatible with the envoyproxy/envoy-wasm release/v1.15 branch
+// 	TODO: delete this file and support the single ABI version
+
+package proxywasm
+
+//nolint
+//export proxy_abi_version_0_1_0
+func proxyABIVersion010() {}