[gn build] Port 5509748

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/Driver/BUILD.gn

@@ -48,6 +48,7 @@ static_library("Driver") {
     "ToolChains/Ananas.cpp",
     "ToolChains/Arch/AArch64.cpp",
     "ToolChains/Arch/ARM.cpp",
+    "ToolChains/Arch/M68k.cpp",
     "ToolChains/Arch/Mips.cpp",
     "ToolChains/Arch/PPC.cpp",
     "ToolChains/Arch/RISCV.cpp",