Don't mark DEBUG_EVENT struct as repr(packed)

That would give it alignment of 1 which is ABI-incompatible with its C
definition.

Author: tbu-

library/std/src/process/tests.rs

@@ -386,7 +386,7 @@ fn test_interior_nul_in_env_value_is_error() {
 fntest_creation_flags(){
 usecrate::os::windows::process::CommandExt;
 usecrate::sys::c::{BOOL,DWORD,INFINITE};
-#[repr(C, packed)]
+#[repr(C)]
 structDEBUG_EVENT{
 pubevent_code:DWORD,
 pubprocess_id:DWORD,