fix: struct fields with specifiers

[t0rr3sp3dr0]

Add missing type specifiers to fix struct and union parsing.

Before:

@class __cached_isReady, __isCancelled, __isCancelledObserverCount, __isExecutingObserverCount, __isFinishedObserverCount, __isReadyObserverCount, __propertyQoS, __state;
@protocol OS_voucher;

@interface NSOperation : NSObject {
    /* instance variables */
    struct { NSOperation *__prevOp; NSOperation *__nextOp; NSOperation *__nextPriOp; NSOperationQueue *__queue; NSMutableArray *__dependencies; NSHashTable *__down_dependencies; long long __unfinished_deps; id /* block */ __completion; void *__obsInfo; void *__implicitObsInfo; double __thread_prio; char *__nameBuffer; NSObject<OS_voucher> *_voucher; id /* block */ __schedule; struct _opaque_pthread_mutex_t { long long __sig; signed char __opaque[56]; } __wait_mutex; struct _opaque_pthread_cond_t { long long __sig; signed char __opaque[40]; } __wait_cond; struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } __lock; signed char _shouldRemoveDependenciesAfterFinish; _Atomic  __state; unsigned char x19; signed char __prio; _Atomic  __cached_isReady; signed char x22; _Atomic  __isCancelled; signed char x24; _Atomic  __propertyQoS; unsigned char x26; _Atomic  __isExecutingObserverCount; unsigned char x28; _Atomic  __isFinishedObserverCount; unsigned char x30; _Atomic  __isReadyObserverCount; unsigned char x32; _Atomic  __isCancelledObserverCount; unsigned char x34; } _iop;
}

After:

@protocol OS_voucher;

@interface NSOperation : NSObject {
    /* instance variables */
    struct { NSOperation *__prevOp; NSOperation *__nextOp; NSOperation *__nextPriOp; NSOperationQueue *__queue; NSMutableArray *__dependencies; NSHashTable *__down_dependencies; long long __unfinished_deps; id /* block */ __completion; void *__obsInfo; void *__implicitObsInfo; double __thread_prio; char *__nameBuffer; NSObject<OS_voucher> *_voucher; id /* block */ __schedule; struct _opaque_pthread_mutex_t { long long __sig; signed char __opaque[56]; } __wait_mutex; struct _opaque_pthread_cond_t { long long __sig; signed char __opaque[40]; } __wait_cond; struct os_unfair_lock_s { unsigned int _os_unfair_lock_opaque; } __lock; signed char _shouldRemoveDependenciesAfterFinish; _Atomic unsigned char __state; signed char __prio; _Atomic signed char __cached_isReady; _Atomic signed char __isCancelled; _Atomic unsigned char __propertyQoS; _Atomic unsigned char __isExecutingObserverCount; _Atomic unsigned char __isFinishedObserverCount; _Atomic unsigned char __isReadyObserverCount; _Atomic unsigned char __isCancelledObserverCount; } _iop;
}

Fixes: blacktop/ipsw#481 (comment)