message: Remove microfrontend/lib from the MICROLITE_CC_HDRS/SRCS.
  The inclusion of microfrontend/lib (more specifically fft.cc) causes a
  compile error when building Tensorflow Lite Micro for Arm Mbed OS. It is not
  used in any other example than micro_speech, so they can safely be
  omitted.
diff: @@ -97,21 +97,6 @@ tensorflow/lite/core/api/error_reporter.cc \
  tensorflow/lite/core/api/flatbuffer_conversions.cc \
  tensorflow/lite/core/api/op_resolver.cc \
  tensorflow/lite/core/api/tensor_utils.cc \
  -tensorflow/lite/experimental/microfrontend/lib/fft.cc \
  -tensorflow/lite/experimental/microfrontend/lib/fft_util.cc \
  -tensorflow/lite/experimental/microfrontend/lib/filterbank.c \
  -tensorflow/lite/experimental/microfrontend/lib/filterbank_util.c \
  -tensorflow/lite/experimental/microfrontend/lib/frontend.c \
  -tensorflow/lite/experimental/microfrontend/lib/frontend_util.c \
  -tensorflow/lite/experimental/microfrontend/lib/log_lut.c \
  -tensorflow/lite/experimental/microfrontend/lib/log_scale.c \
  -tensorflow/lite/experimental/microfrontend/lib/log_scale_util.c \
  -tensorflow/lite/experimental/microfrontend/lib/noise_reduction.c \
  -tensorflow/lite/experimental/microfrontend/lib/noise_reduction_util.c \
  -tensorflow/lite/experimental/microfrontend/lib/pcan_gain_control.c \
  -tensorflow/lite/experimental/microfrontend/lib/pcan_gain_control_util.c \
  -tensorflow/lite/experimental/microfrontend/lib/window.c \
  -tensorflow/lite/experimental/microfrontend/lib/window_util.c \
  tensorflow/lite/kernels/internal/quantization_util.cc \
  tensorflow/lite/kernels/kernel_util.cc
  @@ -121,7 +106,6 @@ MICROLITE_CC_HDRS := \
  $(wildcard tensorflow/lite/experimental/micro/*.h) \
  $(wildcard tensorflow/lite/experimental/micro/kernels/*.h) \
  $(wildcard tensorflow/lite/experimental/micro/memory_planner/*.h) \
  -$(wildcard tensorflow/lite/experimental/microfrontend/lib/*.h) \
  LICENSE \
  tensorflow/core/public/version.h \
  tensorflow/lite/c/builtin_op_data.h \
  