[compiler-rt] [libcxx] [libcxxabi] [libunwind] [libunwind][libcxx][libcxxabi][compiler-rt-builtins] Fix Exception Handling build for wasm (PR #79667)

[via cfe-commits]

trcrsired wrote:

@EricWF You need to build it with wasi-libc

```cpp
mkdir -p "$CURRENTTRIPLEPATH/build/runtimes"
cd $CURRENTTRIPLEPATH/build/runtimes

cmake $LLVMPROJECTPATH/runtimes \
	-GNinja -DCMAKE_BUILD_TYPE=Release \
	-DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_ASM_COMPILER=clang \
	-DCMAKE_SYSROOT=$SYSROOTPATH -DCMAKE_INSTALL_PREFIX=$RUNTIMESINSTALLPATH \
	-DCMAKE_C_COMPILER_TARGET=$TARGETTRIPLE -DCMAKE_CXX_COMPILER_TARGET=$TARGETTRIPLE -DCMAKE_ASM_COMPILER_TARGET=$TARGETTRIPLE \
	-DCMAKE_C_COMPILER_WORKS=On -DCMAKE_CXX_COMPILER_WORKS=On -DCMAKE_ASM_COMPILER_WORKS=On \
	-DCMAKE_SYSTEM_PROCESSOR=$TARGETTRIPLE_CPU \
	-DCMAKE_SYSTEM_NAME=Generic \
	-DLLVM_ENABLE_RUNTIMES=$EHBUILDLIBS \
	-DLIBCXXABI_SILENT_TERMINATE=On \
	-DLIBCXX_CXX_ABI=libcxxabi \
	-DLIBCXX_ENABLE_SHARED=Off \
	-DLIBCXX_ABI_VERSION=1 \
	-DLIBCXX_CXX_ABI_INCLUDE_PATHS="${LLVMPROJECTPATH}/libcxxabi/include" \
	${THREADS_FLAGS} \
	-DLIBCXX_ENABLE_EXCEPTIONS=${ENABLE_EH} \
	-DLIBCXXABI_ENABLE_EXCEPTIONS=${ENABLE_EH} \
	-DLIBCXX_ENABLE_RTTI=${ENABLE_EH} \
	-DLIBCXXABI_ENABLE_RTTI=${ENABLE_EH} \
	-DLLVM_ENABLE_ASSERTIONS=Off -DLLVM_INCLUDE_EXAMPLES=Off -DLLVM_ENABLE_BACKTRACES=Off -DLLVM_INCLUDE_TESTS=Off -DLIBCXX_INCLUDE_BENCHMARKS=Off \
	-DLIBCXX_ENABLE_SHARED=Off -DLIBCXXABI_ENABLE_SHARED=Off \
	-DLIBUNWIND_ENABLE_SHARED=Off ${EH_FLAGS}
ninja
ninja install/strip
```

https://github.com/llvm/llvm-project/pull/79667