Auto merge of #3428 - sthibaul:main, r=JohnTitor

hurd: Complete C API interface

This aligns it on what can be found for linux.

Author: bors

src/unix/hurd/b32.rs

@@ -25,6 +25,8 @@ pub type __ulong32_type = ::c_ulong;
 pub type __s64_type = ::__int64_t;
 pub type __u64_type = ::__uint64_t;
 
+pub type __ipc_pid_t = ::c_ushort;
+
 pub type Elf32_Half = u16;
 pub type Elf32_Word = u32;
 pub type Elf32_Off = u32;

src/unix/hurd/b64.rs

@@ -25,6 +25,8 @@ pub type __ulong32_type = ::c_uint;
 pub type __s64_type = ::c_long;
 pub type __u64_type = ::c_ulong;
 
+pub type __ipc_pid_t = ::c_int;
+
 pub type Elf64_Half = u16;
 pub type Elf64_Word = u32;
 pub type Elf64_Off = u64;