[SDK] winbase.h: Add missing WINADVAPI define (reactos#8019)

Author: HBelusca

sdk/include/psdk/winbase.h

@@ -1,16 +1,22 @@
 #ifndef _WINBASE_
 #define _WINBASE_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(_ADVAPI32_)
+#define WINADVAPI DECLSPEC_IMPORT
+#else
+#define WINADVAPI
+#endif
+
 #if !defined(_KERNEL32_)
 #define WINBASEAPI DECLSPEC_IMPORT
 #else
 #define WINBASEAPI
 #endif
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #include <libloaderapi.h>
 #include <sysinfoapi.h>
 #include <threadpoolapiset.h>
@@ -4183,4 +4189,4 @@ WCHAR * CDECL wine_get_dos_file_name(LPCSTR str);
 #include <synchapi.h>
 #include <processthreadsapi.h>
 
-#endif /* _WINBASE_H */
+#endif /* _WINBASE_ */