cuml: [BUG] Using latest libfaiss causes RAFT handle constructor to hang

Describe the bug Using the latest libfaiss package (1.7.0) causes the RAFT handle constructor to hang.

Steps/Code to reproduce bug

1. Create a fresh Conda environment from conda/environments/cuml_dev_cuda11.0.yml:

conda create -n cuml_dev python=3.7
conda env update -n cuml_dev --file=conda/environments/cuml_dev_cuda11.0.yml

1. Build libcuml from the source:

./build.sh libcuml

1. Run a single Google C++ test which will hang:

$ ./cpp/build/test/ml --gtest_filter=HandleTest.CreateHandleAndDestroy
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from HandleTest
[ RUN      ] HandleTest.CreateHandleAndDestroy

1. Now downgrade libfaiss to 1.6.3 and then re-build libcuml:

conda install -c rapidsai -c nvidia -c rapidsai-nightly -c conda-forge libfaiss=1.6.3
rm -rf cpp/build/
./build.sh libcuml

1. Now the test won’t hang anymore:

$ ./cpp/build/test/ml --gtest_filter=HandleTest.CreateHandleAndDestroy

[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from HandleTest
[ RUN      ] HandleTest.CreateHandleAndDestroy
[       OK ] HandleTest.CreateHandleAndDestroy (437 ms)
[----------] 1 test from HandleTest (438 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (438 ms total)
[  PASSED  ] 1 test.

Environment details (please complete the following information):

• Environment location: Bare-metal
• Linux Distro/Architecture: Ubuntu 18.04 amd64
• GPU Model/Driver: Quadro RTX 8000, driver 450.51.06
• CUDA: 11.0
• Method of cuDF & cuML install: from the source. CMake 3.18.5, GCC 7.5.0, commit hash 8b78fa34c4b2f4a0beb952f74387bd749fdb30e2