Temporary API to support spawn with uid and gid options

build: make "make test" work on OpenBSD

Windows: actually detect mingw-w64 and not 64 bits mode

__MINGW64__ is only defined when using mingw-w64 in 64bits mode, not when
using the 32bits version of the compiler.

Inste

Windows: actually detect mingw-w64 and not 64 bits mode

__MINGW64__ is only defined when using mingw-w64 in 64bits mode, not when
using the 32bits version of the compiler.

Instead, to detect usage of mingw-w64 instead of mingw version of GCC we
should look at __MINGW64_VERSION_MAJOR and __MINGW64_VERSION_MINOR. If one
of these is defined means we are running on mingw-w64 compiler and headers
and not mingw.org build.

Read more here: http://bit.ly/detect-mingw-w64-vs-mingw

Closes #384

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linux: add IN_MOVE_SELF to inotify event mask

Partially fixes joyent/node#3172, behavior is now consistent with inotifywait.

Windows: set loop counters to zero in uv_loop_init

Style fixes

uv.h: make the ssize_t fallback more portable

windows: rename local var errno to errorno

Fixes compiler warning: ‘_errno’ redeclared without dllimport attribute:
previous dllimport ignored.

remove left-over cast fixes #3160

unix: remove kqueue cb == NULL check

The other implementations don't check for it and it's making the counters_init
test fail.

unix: call pipe handle connection cb on accept() error

unix: handle EWOULDBLOCK in uv__read()

unix: handle EWOULDBLOCK in uv__write()

unix: handle EWOULDBLOCK in uv__server_io()

unix: map EWOULDBLOCK to UV_EAGAIN

unix: call pipe handle connection cb on accept() error

unix: handle EWOULDBLOCK in uv__read()

unix: handle EWOULDBLOCK in uv__write()

unix: handle EWOULDBLOCK in uv__server_io()

unix: map EWOULDBLOCK to UV_EAGAIN

Map ENOMEM to UV_ENOMEM

include: remove stray backslash

unix: clean up uv__req_init()

build: print error message when gyp is not installed

64bit offsets for fs operations and cleanup uv_fs_* for uv-win