fix: add manifest file to correctly determine current Windows version

In Windows 8.1 and later, GetVersionEx does not automatically give the
correct information if a manifest file doesn't explicitly mention we
support that version. This will enable further detection for Windows 8.1
and Windows 10/11, with an easy way to add future versions. A list of
all operating system versions can be found here:
https://learn.microsoft.com/en-us/windows/win32/sysinfo/operating-system-version

src/nvim/CMakeLists.txt

@@ -95,6 +95,8 @@ if(MSVC)
  # Disable warnings that give too many false positives.
  target_compile_options(main_lib INTERFACE -wd4311 -wd4146)
  target_compile_definitions(main_lib INTERFACE _CRT_SECURE_NO_WARNINGS _CRT_NONSTDC_NO_DEPRECATE)
+
+ target_sources(main_lib INTERFACE ${CMAKE_CURRENT_LIST_DIR}/os/nvim.manifest)
 else()
  target_compile_options(main_lib INTERFACE -Wall -Wextra -pedantic -Wno-unused-parameter
  -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion

src/nvim/os/nvim.manifest

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+ <assemblyIdentity
+ processorArchitecture="*"
+ version="0.9.0.0"
+ type="win32"
+ name="Neovim"
+ />
+ <description>Neovim</description>
+ <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+ <application>
+ <!-- Windows 10 and Windows 11 -->
+ <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+ <!-- Windows 8.1 -->
+ <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+ <!-- Windows 8 -->
+ <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+ </application>
+ </compatibility>
+</assembly>