This fixes the following error with clang32 src/greenlet/platform/switch_x86_unix.h:54:5: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
This fixes the following error with clang32 src/greenlet/platform/switch_x86_unix.h:54:5: error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]