Fix SpecCPU2017's dependency from timeit-target to build-timeit-target

[aqjune]

Summary

Building SpecCPU2017 using cmake raises this error:

CMake Error at External/SPEC/SpecCPU2017.cmake:263 (add_dependencies):                
  The dependency target "timeit-target" of target "imagevalidate_525-target"          
  does not exist.                                                                     
Call Stack (most recent call first):                                                  
  External/SPEC/CINT2017rate/525.x264_r/CMakeLists.txt:24 (speccpu2017_validate_image)

I think timeit-target should be build-timeit-target instead because cmake's progress output has this line:

[  3%] Built target build-timeit-target

Fixing this resolves the dependency error.

[aqjune]

Remove irrelevant diffs

[MaskRay]

LGTM.

External/SPEC/SpecCPU2017.cmake

macro(speccpu2017_validate_image _imgfile _cmpfile _outfile)
 
   set(VALIDATOR imagevalidate_${BENCHMARK_NO}-target)
   if (NOT TARGET ${VALIDATOR})
     file(GLOB_RECURSE _validator_sources "${SRC_DIR}/image_validator/*.c")
 
     add_executable(${VALIDATOR} ${_validator_sources})
     target_link_libraries(${VALIDATOR} m)
     set_target_properties(${VALIDATOR} PROPERTIES COMPILE_FLAGS "-DSPEC")
-    add_dependencies(${VALIDATOR} timeit-target)
+    add_dependencies(${VALIDATOR} build-timeit-target)
   endif ()
 
   if ((NOT DEFINED _carg_SUITE_TYPE) OR (${BENCHMARK_SUITE_TYPE} IN_LIST _carg_SUITE_TYPE))
     get_filename_component(_basename "${_imgfile}" NAME_WE)
     get_filename_component(_ext "${_imgfile}" EXT)
     llvm_test_verify(
       cd "${RUN_${_carg_RUN_TYPE}_DIR}" &&
       "${CMAKE_CURRENT_BINARY_DIR}/${VALIDATOR}" ${_carg_UNPARSED_ARGUMENTS}