Move Windows version to OS namespace

UnleashedRecomp/os/process.cpp

@@ -1,5 +1,5 @@
-#include "process.h"
-#include "process_detail.h"
+#include <os/process.h>
+#include <os/process_detail.h>
 
 std::filesystem::path os::process::GetExecutablePath()
 {

UnleashedRecomp/os/version.cpp

@@ -0,0 +1,7 @@
+#include <os/version.h>
+#include <os/version_detail.h>
+
+os::version::detail::OSVersion os::version::GetOSVersion()
+{
+    return detail::GetOSVersion();
+}

UnleashedRecomp/os/version.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <os/version_detail.h>
+
+namespace os::version
+{
+    detail::OSVersion GetOSVersion();
+}

UnleashedRecomp/os/version_detail.h

@@ -0,0 +1,13 @@
+#pragma once
+
+namespace os::version::detail
+{
+    struct OSVersion
+    {
+        uint32_t Major{};
+        uint32_t Minor{};
+        uint32_t Build{};
+    };
+
+    OSVersion GetOSVersion();
+}

UnleashedRecomp/os/win32/version_win32.cpp

@@ -0,0 +1,20 @@
+#include <os/version_detail.h>
+
+LIB_FUNCTION(LONG, "ntdll.dll", RtlGetVersion, PRTL_OSVERSIONINFOW);
+
+os::version::detail::OSVersion os::version::detail::GetOSVersion()
+{
+    auto result = os::version::detail::OSVersion{};
+
+    OSVERSIONINFOEXW osvi = { 0 };
+    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEXW);
+
+    if (RtlGetVersion((PRTL_OSVERSIONINFOW)&osvi) != 0)
+        return result;
+
+    result.Major = osvi.dwMajorVersion;
+    result.Minor = osvi.dwMinorVersion;
+    result.Build = osvi.dwBuildNumber;
+
+    return result;
+}