vlfeat: check HAS_CPUID before use of _vl_x86cpu_info_init
vlfeat: check HAS_CPUID before use of _vl_x86cpu_info_init

Check HAS_CPUID before using _vl_x86cpu_info_init to avoid compilation
errors when building on other architectures.

Signed-off-by: Tyler Baker <b3cc311ecf91e7c5c184946246e38d36003af74d@linaro.org>

sunbingfengPI/OpenSFM_Test,oscarlorentzon/OpenSfM,oscarlorentzon/OpenSfM,BrookRoberts/OpenSfM,mapillary/OpenSfM,BrookRoberts/OpenSfM,oscarlorentzon/OpenSfM,mapillary/OpenSfM,BrookRoberts/OpenSfM,sunbingfengPI/OpenSFM_Test,mapillary/OpenSfM,BrookRoberts/OpenSfM,BrookRoberts/OpenSfM,sunbingfengPI/OpenSFM_Test,mapillary/OpenSfM,sunbingfengPI/OpenSFM_Test,oscarlorentzon/OpenSfM,oscarlorentzon/OpenSfM,mapillary/OpenSfM,sunbingfengPI/OpenSFM_Test