Microsoft SEAL installation on macOS

1. brew install cmake autoconf automake libtool shtool gflags

2. xcode-select --install

3. download https://github.com/google/googletest

4. cd googletest-master

5. cmake .

6. make

7. make install

8. download https://github.com/microsoft/SEAL

9. cd SEAL

10. cmake .

11. make

12. make install