elfcore-compat fix uid/gid types

I overlooked the difference between __kernel_uid_t and uid_t when defining
struct compat_elf_prpsinfo.  The result is a regression in 32-bit core
dumps on x86_64, where the NT_PRPSINFO note has the wrong size and layout.
This patch fixes it.
Signed-off-by: Roland McGrath <roland@redhat.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/elfcore-compat.h

@@ -45,8 +45,8 @@ struct compat_elf_prpsinfo
 	char				pr_zomb;
 	char				pr_nice;
 	compat_ulong_t			pr_flag;
-	compat_uid_t			pr_uid;
-	compat_gid_t			pr_gid;
+	__compat_uid_t			pr_uid;
+	__compat_gid_t			pr_gid;
 	compat_pid_t			pr_pid, pr_ppid, pr_pgrp, pr_sid;
 	char				pr_fname[16];
 	char				pr_psargs[ELF_PRARGSZ];