CLOEXEC does not work on Alpine

[rzhao271]

In the VS Code repo, when I bump node-pty, the Alpine build reports the following error

2026-01-13T21:31:14.7685867Z npm error ../src/unix/pty.cc: In function 'void pty_close_inherited_fds()':
2026-01-13T21:31:14.7686207Z npm error ../src/unix/pty.cc:135:40: error: 'CLOSE_RANGE_CLOEXEC' was not declared in this scope
2026-01-13T21:31:14.7686533Z npm error   135 |   if (syscall(SYS_close_range, 3, ~0U, CLOSE_RANGE_CLOEXEC) == 0) {
2026-01-13T21:31:14.7686816Z npm error       |                                        ^~~~~~~~~~~~~~~~~~~
2026-01-13T21:31:14.7687112Z npm error make: *** [pty.target.mk:115: Release/obj.target/pty/src/unix/pty.o] Error 1
2026-01-13T21:31:14.7687392Z npm error gyp ERR! build error 
2026-01-13T21:31:14.7687660Z npm error gyp ERR! stack Error: `make` failed with exit code: 2

Look in pty.cc and see whether we have to use a different constant or implementation for Alpine.