Add libc++.a for x86_64 linux musl from build 10475441

This is needed to build stage1 clang for musl. Because libc++.a in
prebuilts/build-tools/sysroots/x86_64-unknown-linux-musl/lib may
not be up-to-date enough.

Bug: 291000400
Test: run toolchain/llvm_android/build.py --musl
Change-Id: Ica97dd3696267dc57382ab1c58b699de33bec365
diff --git a/clang-r498229/lib/clang/17/lib/x86_64-unknown-linux-musl/libc++.a b/clang-r498229/lib/clang/17/lib/x86_64-unknown-linux-musl/libc++.a
new file mode 100644
index 0000000..56a7ca8
--- /dev/null
+++ b/clang-r498229/lib/clang/17/lib/x86_64-unknown-linux-musl/libc++.a
Binary files differ
diff --git a/clang-r498229/lib/clang/17/lib/x86_64-unknown-linux-musl/libc++abi.a b/clang-r498229/lib/clang/17/lib/x86_64-unknown-linux-musl/libc++abi.a
new file mode 100644
index 0000000..a3a3dd8
--- /dev/null
+++ b/clang-r498229/lib/clang/17/lib/x86_64-unknown-linux-musl/libc++abi.a
Binary files differ