fix: fix build under windows 7 (#250)

* fix: fix build under windows 7

* fix: replace WIN32_WINNT macro check with predefined WM_* message in qwindowkit_windows.h

* fix: remove unnecessary windows version check

Author: fnMrRice

src/core/contexts/win32windowcontext.cpp

@@ -401,9 +401,7 @@ namespace QWK {
         if (((message >= WM_NCCREATE) && (message <= WM_NCACTIVATE)) ||
             ((message >= WM_NCMOUSEMOVE) && (message <= WM_NCMBUTTONDBLCLK)) ||
             ((message >= WM_NCXBUTTONDOWN) && (message <= WM_NCXBUTTONDBLCLK))
-#if (WINVER >= _WIN32_WINNT_WIN8)
             || ((message >= WM_NCPOINTERUPDATE) && (message <= WM_NCPOINTERUP))
-#endif
             || ((message == WM_NCMOUSEHOVER) || (message == WM_NCMOUSELEAVE))) {
             return true;
         } else {

src/core/qwindowkit_windows.h

@@ -61,6 +61,19 @@
 #  define WM_NCUAHDRAWFRAME (0x00AF)
 #endif
 
+// Required missing messages under windows 7
+#ifndef WM_NCPOINTERUPDATE
+#  define WM_NCPOINTERUPDATE (0x0241)
+#endif
+
+#ifndef WM_NCPOINTERDOWN
+#  define WM_NCPOINTERDOWN (0x0242)
+#endif
+
+#ifndef WM_NCPOINTERUP
+#  define WM_NCPOINTERUP (0x0243)
+#endif
+
 using QWK_OSVERSIONINFOW = struct _QWK_OSVERSIONINFOW {
     DWORD dwOSVersionInfoSize;
     DWORD dwMajorVersion;