Fixes the following error on Ubuntu 20.04:

/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libz.a(deflate.o): relocation R_X86_64_PC32 against symbol `z_errmsg' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status
[814/816] Compiling C++ object UnitTests/test_driver.p/test_driver.cpp.o
ninja: build stopped: subcommand failed.