Say "wasm32-wasi" instead of "wasm32-unknown-wasi" in wasi-sdk.

Makefile

@@ -21,7 +21,7 @@ build/llvm.BUILT:
 		-DCMAKE_BUILD_TYPE=MinSizeRel \
 		-DCMAKE_INSTALL_PREFIX=$(PREFIX) \
 		-DLLVM_TARGETS_TO_BUILD=WebAssembly \
-		-DLLVM_DEFAULT_TARGET_TRIPLE=wasm32-unknown-wasi \
+		-DLLVM_DEFAULT_TARGET_TRIPLE=wasm32-wasi \
 		-DLLVM_EXTERNAL_CLANG_SOURCE_DIR=$(LLVM_PROJ_DIR)/clang \
 		-DLLVM_EXTERNAL_LLD_SOURCE_DIR=$(LLVM_PROJ_DIR)/lld \
 		-DLLVM_ENABLE_PROJECTS="lld;clang" \

README.md

@@ -19,7 +19,7 @@ builds configured to set the default target and sysroot for convenience.
 
 One could also use a standard Clang 8.0, build a sysroot from the sources
 mentioned above, and compile with
-"--target=wasm32-unknown-wasi --sysroot=/path/to/sysroot".
+"--target=wasm32-wasi --sysroot=/path/to/sysroot".
 
 ## Notes for Autoconf
 

wasi-sdk.cmake

@@ -6,7 +6,7 @@ cmake_minimum_required(VERSION 3.4.0)
 set(CMAKE_SYSTEM_NAME Wasm)
 set(CMAKE_SYSTEM_VERSION 1)
 set(CMAKE_SYSTEM_PROCESSOR wasm32)
-set(triple wasm32-unknown-wasi)
+set(triple wasm32-wasi)
 
 set(CMAKE_C_COMPILER ${WASI_SDK_PREFIX}/bin/clang)
 set(CMAKE_CXX_COMPILER ${WASI_SDK_PREFIX}/bin/clang++)