Fix name clash with libcap 2.29.

Taken from upstream:
https://github.com/iputils/iputils/commit/18f9a84e0e702841d6cc4d5f593de4fbd1348e83

diff --git a/ninfod/ninfod.c b/ninfod/ninfod.c
--- a/ninfod/ninfod.c
+++ b/ninfod/ninfod.c
@@ -455,7 +455,7 @@ static void do_daemonize(void)
 /* --------- */
 #ifdef HAVE_LIBCAP
 static const cap_value_t cap_net_raw = CAP_NET_RAW;
-static const cap_value_t cap_setuid =  CAP_SETUID; 
+static const cap_value_t cap_setuserid = CAP_SETUID;
 static cap_flag_value_t cap_ok;
 #else
 static uid_t euid;
@@ -487,7 +487,7 @@ static void limit_capabilities(void)
 
 	cap_get_flag(cap_cur_p, CAP_SETUID, CAP_PERMITTED, &cap_ok);
 	if (cap_ok != CAP_CLEAR)
-		cap_set_flag(cap_p, CAP_PERMITTED, 1, &cap_setuid, CAP_SET);
+		cap_set_flag(cap_p, CAP_PERMITTED, 1, &cap_setuserid, CAP_SET);
 
 	if (cap_set_proc(cap_p) < 0) {
 		DEBUG(LOG_ERR, "cap_set_proc: %s\n", strerror(errno));
@@ -520,8 +520,8 @@ static void drop_capabilities(void)
 
 	/* setuid / setuid */
 	if (cap_ok != CAP_CLEAR) {
-		cap_set_flag(cap_p, CAP_PERMITTED, 1, &cap_setuid, CAP_SET);
-		cap_set_flag(cap_p, CAP_EFFECTIVE, 1, &cap_setuid, CAP_SET);
+		cap_set_flag(cap_p, CAP_PERMITTED, 1, &cap_setuserid, CAP_SET);
+		cap_set_flag(cap_p, CAP_EFFECTIVE, 1, &cap_setuserid, CAP_SET);
 
 		if (cap_set_proc(cap_p) < 0) {
 			DEBUG(LOG_ERR, "cap_set_proc: %s\n", strerror(errno));
630446aedab1d62a81667cb657'>commit</a><a href='/guix/diff/gnu/services/herd.scm?id=a3d7c67a926bb5630446aedab1d62a81667cb657'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/herd.scm'>
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<div class='path'>path: <a href='/guix/log/?id=a3d7c67a926bb5630446aedab1d62a81667cb657'>root</a>/<a href='/guix/log/gnu?id=a3d7c67a926bb5630446aedab1d62a81667cb657'>gnu</a>/<a href='/guix/log/gnu/services?id=a3d7c67a926bb5630446aedab1d62a81667cb657'>services</a>/<a href='/guix/log/gnu/services/herd.scm?id=a3d7c67a926bb5630446aedab1d62a81667cb657'>herd.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/herd.scm?id=a3d7c67a926bb5630446aedab1d62a81667cb657&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-07-21 11:58:44 -0400'>2023-07-21</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=f15c5edb1a2423402b32a5262627eb2141becf65'>services: herd: Add a new 'current-service' procedure.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/herd.scm (current-service): New procedure, mostly reusing the
existing current-services.
(current-services): Implement in terms of the above procedure.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-05-30 00:15:29 +0200'>2023-05-30</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=d23d8fcee99e7b127f9e649925caca9cf0d36e76'>services: herd: "Resolve" transient services only when needed.</a><span class='msg-avail'>...<span class='msg-tooltip'>This allows us to get rid of the "eval root" actions, which in turn
would lead to confusing "Evaluating user expression" messages.

Fixes &lt;https://issues.guix.gnu.org/55857&gt;.

* gnu/services/herd.scm (resolve-transients): In 'values', avoid
'eval-there' call when UNRESOLVED is empty.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-04-21 16:16:37 +0200'>2023-04-21</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=95731b4ef1991f5b85aa9ec9d4fb97c006bec65d'>services: herd: 'load-services/safe' is synonymous with 'load-services'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 547965aa27b6a09cadf42130b7ec7db3f1aee61f.

* gnu/services/herd.scm (load-services/safe): Make an alias for
'load-services'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-03-26 23:24:23 +0200'>2023-03-26</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=547965aa27b6a09cadf42130b7ec7db3f1aee61f'>services: herd: Remove workaround for Shepherd &lt; 0.5.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/herd.scm (load-services/safe): Remove workaround for
Shepherd &lt; 0.5.0, released in 2018.
</span></span></td><td>Ludovic Courtès</td></tr>
u/packages/xml.scm, gnu/packages/xorg.scm,
  gnu/packages/yasm.scm, gnu/packages/zip.scm,
  guix/build/cmake-build-system.scm, guix/build/perl-build-system.scm,
  guix/build/python-build-system.scm, guix/download.scm: Replaces uses of
  #:renamer and 'symbol-prefix-proc' with #:prefix.
</span></span></td><td>Mark H Weaver</td></tr>