Revert "[Fuchsia] Not building llvm-mt when LIBXML2 is not enabled." (#136216)

Reverts #135877

This is causing some problems on Fuchsia's windows CI. We'll need a
different solution to triage other builders.


https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci/clang-windows-x64/b8717476961063994817/overview

Author: ilovepi

clang/cmake/caches/Fuchsia-stage2.cmake

@@ -459,6 +459,7 @@ set(LLVM_TOOLCHAIN_TOOLS
   llvm-libtool-darwin
   llvm-lipo
   llvm-ml
+  llvm-mt
   llvm-nm
   llvm-objcopy
   llvm-objdump
@@ -480,10 +481,6 @@ set(LLVM_TOOLCHAIN_TOOLS
   scan-build-py
   CACHE STRING "")
 
-if (LLVM_ENABLE_LIBXML2)
-  list(APPEND LLVM_TOOLCHAIN_TOOLS llvm-mt)
-endif()
-
 set(LLVM_Toolchain_DISTRIBUTION_COMPONENTS
   bolt
   clang