"configure --use-cuda=no" option is not respected

[chuanma]

I'm trying to build kaldi on a GPU server, but I'd like to turn off CUDA by adding --use-cuda=no. However, it failed with the following error message.

Note that I didn't make cub under the tools/ folder because I was creating a build for Android.

CXX=clang++ ./configure --static --use-cuda=no --openblas-root=/opt/openblas_install/arm --host=arm-linux-androideabi --android-incdir=/opt/android-toolchain-home/arm/sysroot/usr/include/
Configuring KALDI to use OPENBLAS
Configuring ...
Checking compiler arm-linux-androideabi-clang++ ...
***configure failed: Could not find file /cub/cub.cuh:
  you may not have installed cub. See ../tools/INSTALL ***

I think this bug was introduced in a recent PR, and I have a fix (see my comment link below).

741b75b#r31325437