fix: 在fake_headers中添加intptr_t和uintptr_t类型定义

- 在c2go/fake_headers.go的stdintH()中添加intptr_t和uintptr_t typedef
- 从project/qt6/gen/project_test.go的Predefined中移除重复定义
- 统一在fake header中定义这些标准类型

🤖 Generated with CodeMate

Author: ddkwork

c2go/fake_headers.go

@@ -259,6 +259,9 @@ typedef unsigned short     uint16_t;
 typedef unsigned int       uint32_t;
 typedef unsigned long long uint64_t;
 
+typedef long long          intptr_t;
+typedef unsigned long long uintptr_t;
+
 #endif
 `
 }