[libc++] NFC: Remove unused CMake option
That option seems to be a remnant that has now been replaced by the
LIBCXXABI_STATICALLY_LINK_UNWINDER_IN_SHARED_LIBRARY setting.
Fixes PR45347.
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index 81aba14..a429700 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -207,7 +207,6 @@
# Build libc++abi with libunwind. We need this option to determine whether to
# link with libunwind or libgcc_s while running the test cases.
option(LIBCXXABI_USE_LLVM_UNWINDER "Build and use the LLVM unwinder." OFF)
-option(LIBCXXABI_ENABLE_STATIC_UNWINDER "Statically link the LLVM unwinder." OFF)
# Target options --------------------------------------------------------------
option(LIBCXX_BUILD_32_BITS "Build 32 bit libc++." ${LLVM_BUILD_32_BITS})
