3.14/msys: port MSYS2 0040 (pycore_fileutils: add MINGW support) (#26)

Wall: the xml2rfc feedstock's windows leg (tebako-packages/xml2rfc
run 34806287957) — every timed connect on the mingw/ucrt64 runtime
died instantly with WinError 10035 while blocking sockets worked.
Upstream guards _PyIsSelectable_fd on _MSC_VER only, so under the
ucrt64 gcc a Winsock SOCKET handle fails the POSIX fd < FD_SETSIZE
check and socketmodule's internal_connect never waits. 0074 widened
only selectmodule's call site; 0040 widens the macro definition to
MS_WINDOWS, covering every consumer (rides 0002's MS_WINDOWS define,
series order guaranteed).

Co-authored-by: tebako-ci <ci@tamatebako.dev>

Author: ronaldtse

patches/3.14/patch-3.14.yaml

@@ -60,6 +60,15 @@
 # modules switch to have_dynamic_loading), which restores 0076's
 # hunk-3 context to MSYS2-verbatim.
 #
+# v0.3.7 answers the xml2rfc feedstock's windows leg
+# (tebako-packages/xml2rfc run 34806287957): every TIMED connect died
+# instantly with WinError 10035 while blocking sockets worked — the
+# upstream _PyIsSelectable_fd guard admits only _MSC_VER, so under the
+# ucrt64 gcc a Winsock SOCKET handle fails the POSIX fd < FD_SETSIZE
+# check and internal_connect never waits — answered by 0040
+# (pycore_fileutils_msys), which widens the macro DEFINITION to
+# MS_WINDOWS (0074 had widened only selectmodule's call site).
+#
 # NEVER a jit variant on this platform: CPython's experimental JIT target
 # whitelist (PEP 774's tiering, Tools/jit/_targets.py per PEP 836's
 # build-story wording) admits only Tier-1 MSVC windows — a mingw/ucrt64
@@ -112,6 +121,8 @@ patches:
     file: io_winconsoleio_msys.patch
   - feature: win_resources_pythonw_msys
     file: win_resources_pythonw_msys.patch
+  - feature: pycore_fileutils_msys
+    file: pycore_fileutils_msys.patch
   - feature: configure_inet_pton_msys
     file: configure_inet_pton_msys.patch
   - feature: timemodule_msys

patches/3.14/pycore_fileutils_msys.patch

@@ -0,0 +1,36 @@
+# pycore_fileutils_msys.patch
+#
+# Target:  Include/internal/pycore_fileutils.h (windows-msys scenario)
+# Source:  MSYS2 MINGW-packages mingw-w64-python 0040
+#          "pycore_fileutils: add MINGW support" (ported verbatim;
+#          the 3.14.7 hunk context is byte-identical to the MSYS2
+#          base — same blob hashes)
+#
+# Wall item (tebako-packages/xml2rfc windows leg, run 34806287957):
+# every TIMED connect on the mingw/ucrt64 runtime died instantly with
+# WinError 10035 (WSAEWOULDBLOCK surfaced as failure) while blocking
+# sockets worked end-to-end (full HTTPS proved over them). Root
+# cause: socketmodule.c's IS_SELECTABLE consults _PyIsSelectable_fd,
+# whose upstream guard admits only _MSC_VER — under the ucrt64 gcc
+# the macro falls to its POSIX branch, and a Winsock SOCKET handle
+# (a large opaque value, not a small CRT fd) fails the
+# fd < FD_SETSIZE check, so internal_connect never waits on the
+# connecting socket. selectmodule's own call site was already
+# MS_WIN32-widened by selectmodule_msys (0074); this patch widens
+# the macro DEFINITION, covering socketmodule's IS_SELECTABLE sites
+# and every future consumer. Rides pyport_ms_windows_msys (0002)
+# for the MS_WINDOWS define — the series order guarantees it.
+
+diff --git a/Include/internal/pycore_fileutils.h b/Include/internal/pycore_fileutils.h
+index 2c6d6da..4ce1516 100644
+--- a/Include/internal/pycore_fileutils.h
++++ b/Include/internal/pycore_fileutils.h
+@@ -13,7 +13,7 @@ extern "C" {
+ 
+ 
+ /* A routine to check if a file descriptor can be select()-ed. */
+-#ifdef _MSC_VER
++#ifdef MS_WINDOWS
+     /* On Windows, any socket fd can be select()-ed, no matter how high */
+     #define _PyIsSelectable_fd(FD) (1)
+ #else