Revert "Add Thread::Local(T) (#15616)" (#16179)

This reverts commit 8fda88f.

It's an internal type, we don't plan to use it anymore, and #16173 is
meant to replace it.

It's main feature was the ability to work on every target (unlike the current `@[ThreadLocal]` annotation) and to register destructors... but the annotation can be fixed using the EmulatedTLS LLVM option, and the destructor is crashing on x86_64-darwin when mixing pthreads, unwind and pcre2.

Author: ysbaddaden

src/crystal/system/thread_local.cr

@@ -26,7 +26,6 @@ lib LibC
   fun pthread_getspecific(__key : PthreadKeyT) : Void*
   fun pthread_join(__pthread : PthreadT, __return_value_ptr : Void**) : Int
   fun pthread_key_create(__key_ptr : PthreadKeyT*, __key_destructor : Void* ->) : Int
-  fun pthread_key_delete(__key_ptr : PthreadKeyT) : Int
 
   fun pthread_mutexattr_destroy(__attr : PthreadMutexattrT*) : Int
   fun pthread_mutexattr_init(__attr : PthreadMutexattrT*) : Int

src/crystal/system/unix/thread_local.cr

@@ -13,12 +13,9 @@ lib LibC
   fun pthread_cond_wait(x0 : PthreadCondT*, x1 : PthreadMutexT*) : Int
   fun pthread_create(x0 : PthreadT*, x1 : PthreadAttrT*, x2 : Void* -> Void*, x3 : Void*) : Int
   fun pthread_detach(x0 : PthreadT) : Int
-  fun pthread_getspecific(PthreadKeyT) : Void*
   fun pthread_get_stackaddr_np(x0 : PthreadT) : Void*
   fun pthread_get_stacksize_np(x0 : PthreadT) : SizeT
   fun pthread_join(x0 : PthreadT, x1 : Void**) : Int
-  fun pthread_key_create(PthreadKeyT*, (Void*) ->) : Int
-  fun pthread_key_delete(PthreadKeyT) : Int
   fun pthread_mutexattr_destroy(x0 : PthreadMutexattrT*) : Int
   fun pthread_mutexattr_init(x0 : PthreadMutexattrT*) : Int
   fun pthread_mutexattr_settype(x0 : PthreadMutexattrT*, x1 : Int) : Int
@@ -29,5 +26,4 @@ lib LibC
   fun pthread_mutex_unlock(x0 : PthreadMutexT*) : Int
   fun pthread_self : PthreadT
   fun pthread_setname_np(Char*) : Int
-  fun pthread_setspecific(PthreadKeyT, Void*) : Int
 end

src/crystal/system/wasi/thread_local.cr

@@ -40,7 +40,6 @@ lib LibC
   end
 
   type PthreadT = Void*
-  alias PthreadKeyT = UInt
   alias SSizeT = Long
   alias SusecondsT = Int
   alias TimeT = Long

src/crystal/system/win32/thread_local.cr

@@ -25,11 +25,8 @@ lib LibC
   fun pthread_create(newthread : PthreadT*, attr : PthreadAttrT*, start_routine : Void* -> Void*, arg : Void*) : Int
   fun pthread_detach(th : PthreadT) : Int
   fun pthread_getattr_np(thread : PthreadT, attr : PthreadAttrT*) : Int
-  fun pthread_getspecific(PthreadKeyT) : Void*
   fun pthread_equal(thread1 : PthreadT, thread2 : PthreadT) : Int
   fun pthread_join(th : PthreadT, thread_return : Void**) : Int
-  fun pthread_key_create(PthreadKeyT*, (Void*) ->) : Int
-  fun pthread_key_delete(PthreadKeyT) : Int
   fun pthread_mutexattr_destroy(attr : PthreadMutexattrT*) : Int
   fun pthread_mutexattr_init(attr : PthreadMutexattrT*) : Int
   fun pthread_mutexattr_settype(attr : PthreadMutexattrT*, type : Int) : Int
@@ -40,5 +37,4 @@ lib LibC
   fun pthread_mutex_unlock(mutex : PthreadMutexT*) : Int
   fun pthread_self : PthreadT
   fun pthread_setname_np(PthreadT, Char*) : Int
-  fun pthread_setspecific(PthreadKeyT, Void*) : Int
 end

src/lib_c/aarch64-android/c/pthread.cr

@@ -41,7 +41,6 @@ lib LibC
   end
 
   alias PthreadT = ULong
-  alias PthreadKeyT = UInt
   alias SSizeT = Long
   alias SusecondsT = Long
   alias TimeT = Long

src/lib_c/aarch64-darwin/c/pthread.cr

@@ -17,10 +17,7 @@ lib LibC
   fun pthread_create(x0 : PthreadT*, x1 : PthreadAttrT*, x2 : Void* -> Void*, x3 : Void*) : Int
   fun pthread_detach(x0 : PthreadT) : Int
   fun pthread_getattr_np(x0 : PthreadT, x1 : PthreadAttrT*) : Int
-  fun pthread_getspecific(PthreadKeyT) : Void*
   fun pthread_join(x0 : PthreadT, x1 : Void**) : Int
-  fun pthread_key_create(PthreadKeyT*, (Void*) ->) : Int
-  fun pthread_key_delete(PthreadKeyT) : Int
   fun pthread_mutexattr_destroy(x0 : PthreadMutexattrT*) : Int
   fun pthread_mutexattr_init(x0 : PthreadMutexattrT*) : Int
   fun pthread_mutexattr_settype(x0 : PthreadMutexattrT*, x1 : Int) : Int
@@ -31,5 +28,4 @@ lib LibC
   fun pthread_mutex_unlock(x0 : PthreadMutexT*) : Int
   fun pthread_self : PthreadT
   fun pthread_setname_np(PthreadT, Char*) : Int
-  fun pthread_setspecific(PthreadKeyT, Void*) : Int
 end