Log Message:
libuv: update to 1.15.0

Version 1.15.0 (Stable)

* unix: limit uv__has_forked_with_cfrunloop to macOS
* win: fix buffer size in uv__getpwuid_r()
* win,tty: improve SIGWINCH support
* unix: use fchmod() in uv_fs_copyfile()
* unix: support copying empty files
* unix: truncate destination in uv_fs_copyfile()
* win,build: keep cwd when setting build environment
* test: add NetBSD support to test-udp-ipv6.c
* unix: add NetBSD support in core.c
* linux: increase thread stack size with musl libc
* netbsd: correct uv_exepath() on NetBSD
* test: clean up semaphore after use
* win,build: bump vswhere_usability_wrapper to 2.0.0
* win: let UV_PROCESS_WINDOWS_HIDE hide consoles
* zos: lock protect global epoll list in epoll_ctl
* zos: change platform name to match python
* android: fix getifaddrs()
* netbsd: implement uv__tty_is_slave()
* zos: fix readlink for mounts with system variables
* test: sort the tests alphabetically
* windows: fix compilation warnings
* build: avoid -fstrict-aliasing compile option
* win: remove unused variables
* unix: remove unused variables
* netbsd: disable poll_bad_fdtype on NetBSD
* netbsd: use uv__cloexec and uv__nonblock
* test: fix udp_multicast_join6 on NetBSD
* unix,win: add uv_mutex_init_recursive()
* netbsd: do not exclude IPv6 functionality
* fsevents: watch files with fsevents on macos 10.7+
* unix: retry on ENOBUFS in sendmsg(2)