Remove some unused defines in multiprocessing.h. (GH-15661)

It looks like they are unused since
87cf220.

Author: sir-sigurd

Modules/_multiprocessing/multiprocessing.h

@@ -27,14 +27,6 @@
 #    include <semaphore.h>
      typedef sem_t *SEM_HANDLE;
 #  endif
-#  define HANDLE int
-#  define SOCKET int
-#  define BOOL int
-#  define UINT32 uint32_t
-#  define INT32 int32_t
-#  define TRUE 1
-#  define FALSE 0
-#  define INVALID_HANDLE_VALUE (-1)
 #endif
 
 /*
@@ -72,8 +64,6 @@
 #  define T_HANDLE T_POINTER
 #  define F_SEM_HANDLE F_HANDLE
 #  define T_SEM_HANDLE T_HANDLE
-#  define F_DWORD "k"
-#  define T_DWORD T_ULONG
 #else
 #  define F_HANDLE "i"
 #  define T_HANDLE T_INT