Win32: Remove checks for pre-XP Windows

Windows XP is the oldest version supported by GLFW 3.4.

src/win32_platform.h

@@ -160,9 +160,6 @@ typedef enum
 #endif /*DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2*/
 
 // HACK: Define versionhelpers.h functions manually as MinGW lacks the header
-#define IsWindowsXPOrGreater()                                 \
-    _glfwIsWindowsVersionOrGreaterWin32(HIBYTE(_WIN32_WINNT_WINXP),   \
-                                        LOBYTE(_WIN32_WINNT_WINXP), 0)
 #define IsWindowsVistaOrGreater()                                     \
     _glfwIsWindowsVersionOrGreaterWin32(HIBYTE(_WIN32_WINNT_VISTA),   \
                                         LOBYTE(_WIN32_WINNT_VISTA), 0)

src/win32_window.c

@@ -468,12 +468,9 @@ static void acquireMonitor(_GLFWwindow* window)
 
         // HACK: When mouse trails are enabled the cursor becomes invisible when
         //       the OpenGL ICD switches to page flipping
-        if (IsWindowsXPOrGreater())
-        {
         SystemParametersInfo(SPI_GETMOUSETRAILS, 0, &_glfw.win32.mouseTrailSize, 0);
         SystemParametersInfo(SPI_SETMOUSETRAILS, 0, 0, 0);
     }
-    }
 
     if (!window->monitor->window)
         _glfw.win32.acquiredMonitorCount++;
@@ -495,7 +492,6 @@ static void releaseMonitor(_GLFWwindow* window)
         SetThreadExecutionState(ES_CONTINUOUS);
 
         // HACK: Restore mouse trail length saved in acquireMonitor
-        if (IsWindowsXPOrGreater())
         SystemParametersInfo(SPI_SETMOUSETRAILS, _glfw.win32.mouseTrailSize, 0, 0);
     }