Fixed 'WebP/decode.h' file not found issue
Fixed 'WebP/decode.h' file not found issue

RoyZeng/iOS-WebP,1yvT0s/iOS-WebP,1yvT0s/iOS-WebP,RoyZeng/iOS-WebP,waynett/iOS-WebP,waynett/iOS-WebP,seanooi/iOS-WebP,LIQC/iOS-WebP,bufanwyl/iOS-WebP,bufanwyl/iOS-WebP,LIQC/iOS-WebP