Revert "[mlir] Add mlirTranslateModuleToLLVMIR to MLIR-C (#73117)"

Breaks https://lab.llvm.org/buildbot/#/builders/5/builds/38700

This reverts commit ad0b2a5.

Author: vitalybuka

mlir/include/mlir-c/Target/LLVMIR.h

@@ -14,7 +14,6 @@ add_subdirectory(Interfaces)
 add_subdirectory(IR)
 add_subdirectory(RegisterEverything)
 add_subdirectory(Transforms)
-add_subdirectory(Target)
 
 if(MLIR_ENABLE_EXECUTION_ENGINE)
   add_subdirectory(ExecutionEngine)
@@ -37,3 +36,4 @@ if(MLIR_BUILD_MLIR_C_DYLIB)
     endif()
   endif()
 endif()
+