Revert "[Fuchsia] Enable llvm-driver build"

This reverts commit 4eadd19.

Doesn't work on macos. I'll investigate more

Author: abrachet

clang/cmake/caches/Fuchsia-stage2.cmake

@@ -22,7 +22,6 @@ set(LLVM_ENABLE_ZLIB ON CACHE BOOL "")
 set(LLVM_INCLUDE_DOCS OFF CACHE BOOL "")
 set(LLVM_INCLUDE_EXAMPLES OFF CACHE BOOL "")
 set(LLVM_STATIC_LINK_CXX_STDLIB ON CACHE BOOL "")
-set(LLVM_TOOL_LLVM_DRIVER_BUILD ON CACHE BOOL "")
 set(LLVM_USE_RELATIVE_PATHS_IN_FILES ON CACHE BOOL "")
 
 if(WIN32)
@@ -293,7 +292,6 @@ set(LLVM_TOOLCHAIN_TOOLS
   llvm-cxxfilt
   llvm-debuginfod-find
   llvm-dlltool
-  llvm-driver
   llvm-dwarfdump
   llvm-dwp
   llvm-ifs