Fixing conflicting macro definitions between curses.h and the standard library.

Fixing conflicting macro definitions between curses.h and the standard library.

POSIX allows certain macros to exist with generic names (i.e. refresh(), move(), and erase()) to exist in `curses.h` which conflict with functions found in std::filesystem, among others. This patch undefs the macros in question and adds them to LIBCPP_PUSH_MACROS and LIBCPP_POP_MACROS.

Reviewed By: #libc, philnik, ldionne

Differential Revision: https://reviews.llvm.org/D147356