Created by: gfwm2013

在以下文件中添加cmath的头文件，使得armlinux gcc可以在树莓派和rk3399上编译 test=develop

lite/core/arena/framework.h
lite/core/mir/fusion/conv_bn_fuser.h
lite/kernels/arm/batch_norm_compute_test.cc
lite/kernels/arm/decode_bboxes_compute.cc
lite/kernels/arm/decode_bboxes_compute_test.cc
lite/kernels/arm/lrn_compute_test.cc
lite/kernels/arm/softmax_compute_test.cc