gnu: sudo: Fix build on aarch64.

* gnu/packages/admin.scm (sudo)[source]: Add patch.
* gnu/packages/patches/sudo-missing-sudo_pt_regs-aarch64.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1806,6 +1806,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/slim-reset.patch				\
   %D%/packages/patches/slim-login.patch				\
   %D%/packages/patches/slim-display.patch			\
+  %D%/packages/patches/sudo-missing-sudo_pt_regs-aarch64.patch	\
   %D%/packages/patches/syslinux-gcc10.patch			\
   %D%/packages/patches/syslinux-strip-gnu-property.patch	\
   %D%/packages/patches/snappy-add-O2-flag-in-CmakeLists.txt.patch	\

gnu/packages/admin.scm

@@ -1780,6 +1780,7 @@ system administrator.")
               (sha256
                (base32
                 "1gjingc1h7d6p17m0nn87yiwh8gbdchg4w4kv8s4g89wv0q6wixm"))
+              (patches (search-patches "sudo-missing-sudo_pt_regs-aarch64.patch"))
               (modules '((guix build utils)))
               (snippet
                '(begin

gnu/packages/patches/sudo-missing-sudo_pt_regs-aarch64.patch

@@ -0,0 +1,26 @@
+From d549adf04bfde7936306203e2e8886ffd93d00ea Mon Sep 17 00:00:00 2001
+From: Pierre Bourdon <delroth@gmail.com>
+Date: Tue, 7 Jun 2022 17:14:39 +0200
+Subject: [PATCH] exec_ptrace: fix missing sudo_pt_regs on aarch64
+
+AArch64 already had an existing "user_pt_regs" struct and didn't need a
+struct alias before the renaming to "sudo_pt_regs". Make the code build
+again by adding the now missing alias.
+
+Fixes: 2eb8ff17
+---
+ src/exec_ptrace.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/exec_ptrace.h b/src/exec_ptrace.h
+index 7f26283a8..4a5a86581 100644
+--- a/src/exec_ptrace.h
++++ b/src/exec_ptrace.h
+@@ -76,6 +76,7 @@
+ # define reg_arg4(x)		(x).r10
+ #elif defined(__aarch64__)
+ # define SECCOMP_AUDIT_ARCH	AUDIT_ARCH_AARCH64
++# define sudo_pt_regs		struct user_pt_regs
+ # define reg_syscall(x)		(x).regs[8]	/* w8 */
+ # define reg_retval(x)		(x).regs[0]	/* x0 */
+ # define reg_sp(x)		(x).sp		/* sp */