emacs-29 265b91d891: Revert "; Bump minimum supported Windows version for MinGW64 to Windows 10."

[Eli Zaretskii]

branch: emacs-29
commit 265b91d891adfad1051db38c6d2202d28cd0f67b
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Revert "; Bump minimum supported Windows version for MinGW64 to Windows 10."
    
    This reverts commit 75155e458601a3597d382660d0be863ab4d512c0.
    Evidently, some MSYS2/MinGW64 folks still think Windows 8.1
    is the minimum supported version, even though MinGW-w64 switched
    to Windows 10 as the default target in January 2022.
---
 etc/PROBLEMS   | 6 +++---
 nt/INSTALL.W64 | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 6db9e6d5be..634480cce7 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -3487,9 +3487,9 @@ The error message might be something like
 
 This happens if you try to build Emacs on versions of MS-Windows older
 than the minimum version supported by MinGW-w64.  As of Dec 2022, the
-minimum Windows version supported by MSYS2/MinGW-w64 is 10, and the
-computer hardware (CPU, memory, disk) should also match the minimum
-Windows 10 requirements.
+minimum supported Windows version is 8.1, and the computer hardware
+(CPU, memory, disk) should also match the minimum Windows 8.1
+requirements.
 
 *** Segfault during 'make'
 
diff --git a/nt/INSTALL.W64 b/nt/INSTALL.W64
index cfb913a81e..26420214b7 100644
--- a/nt/INSTALL.W64
+++ b/nt/INSTALL.W64
@@ -18,8 +18,8 @@ Emacs with the full repository, or less if you're using a 
release tarball.
 
 As of December 2022, the minimum supported system, both for building
 Emacs with the MSYS2/MinGW-w64 toolchain and for running the produced
-binary, is Windows 10.  The computer hardware should also match the
-Microsoft requirements for Windows 10.
+binary, is Windows 8.1.  The computer hardware should also match the
+Microsoft requirements for Windows 8.1.
 
 * Set up the MinGW-w64 / MSYS2 build environment