[PATCH v2] docs/about: Update the support statement for Windows

[Thomas Huth]

Our support statement for Windows currently talks about "Vista / Server
2008" - which is related to the API of Windows, and this is not easy
to understand for the non-technical users. Additionally, glib sets the
_WIN32_WINNT macro to 0x0601 already, which indicates the Windows 7 API,
so QEMU effectively depends on the Windows 7 API, too.

Thus let's bump the _WIN32_WINNT setting in QEMU to the same level as
glib uses and adjust our support statement in the documentation to
something similar that we're using for Linux and the *BSD systems
(i.e. only the two most recent versions), which should hopefully be
easier to understand for the users now.

And since we're nowadays also compile-testing QEMU with MSYS2 on Windows
itself, I think we could mention this build environment here, too.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/880
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 v2: Rephrase and update the _WIN32_WINNT macro, too

 docs/about/build-platforms.rst | 14 +++++++++-----
 include/qemu/osdep.h           |  2 +-
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/docs/about/build-platforms.rst b/docs/about/build-platforms.rst
index e9163ba556..1958edb430 100644
--- a/docs/about/build-platforms.rst
+++ b/docs/about/build-platforms.rst
@@ -86,11 +86,15 @@ similar versions.
 Windows
 -------
 
-The project supports building with current versions of the MinGW toolchain,
-hosted on Linux (Debian/Fedora).
-
-The version of the Windows API that's currently targeted is Vista / Server
-2008.
+The project aims to support the two most recent versions of Windows that are
+still supported by the vendor. The minimum Windows API that is currently
+targeted is "Windows 7", so theoretically the QEMU binaries can still be run
+on older versions of Windows, too. However, such old versions of Windows are
+not tested anymore, so it is recommended to use one of the latest versions of
+Windows instead.
+
+The project supports building QEMU with current versions of the MinGW
+toolchain, either hosted on Linux (Debian/Fedora) or via MSYS2 on Windows.
 
 .. _Homebrew: https://brew.sh/
 .. _MacPorts: https://www.macports.org/
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 1c1e7eca98..e2f88597b6 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -75,7 +75,7 @@ QEMU_EXTERN_C int daemon(int, int);
 #ifdef _WIN32
 /* as defined in sdkddkver.h */
 #ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0600 /* Vista */
+#define _WIN32_WINNT 0x0601 /* Windows 7 API */
 #endif
 /* reduces the number of implicitly included headers */
 #ifndef WIN32_LEAN_AND_MEAN
-- 
2.27.0