refactor: define SYSAPI_WINDOWS and WINAPI_WINDOWS in cmake, remove the define from Common.h

CMakeLists.txt

@@ -107,6 +107,7 @@ set(REQUIRED_LIBPORTAL_VERSION 0.8)
 set(REQUIRED_QT_VERSION 6.7.0)
 
 if (WIN32)
+  add_definitions(-DSYSAPI_WIN32 -DWINAPI_MSWINDOWS)
   # VSCMD_ARG_TGT_ARCH is set on CI
   if ("$ENV{VSCMD_ARG_TGT_ARCH}" STREQUAL "")
     # NOT on CI

src/lib/common/Common.h

@@ -7,14 +7,13 @@
 
 #pragma once
 
-#if defined(_WIN32)
-#define SYSAPI_WIN32 1
-#define WINAPI_MSWINDOWS 1
-#elif HAVE_CONFIG_H
+#if !SYSAPI_WIN32
+#if HAVE_CONFIG_H
 #include "Config.h"
 #else
 #error "config.h missing"
 #endif
+#endif
 
 // define nullptr
 #include <stddef.h>