gnu: libcap: Make 'libcap/next' the default libcap.

* gnu/packages/avahi.scm (avahi)[inputs]: Refer to LIBCAP-2.31 instead of LIBCAP.
* gnu/packages/base.scm (coreutils)[inputs]: Likewise.
* gnu/packages/linux.scm (libcap): Rename to ...
(libcap-2.31): ... this.
(libcap/next): Rename to ...
(libcap): ... this.
(libcap/next): Define as deprecated alias for LIBCAP.
(fakeroot)[inputs]: Change from LIBCAP/NEXT to LIBCAP.
* gnu/packages/ntp.scm (chrony, ntp)[inputs]: Likewise.

gnu/packages/avahi.scm

@@ -74,7 +74,7 @@
        ("expat" ,expat)
        ("gdbm" ,gdbm)
        ("glib" ,glib)
-       ("libcap" ,libcap)            ;to enable chroot support in avahi-daemon
+       ("libcap" ,libcap-2.31)       ;to enable chroot support in avahi-daemon
        ("libdaemon" ,libdaemon)
        ("libevent" ,libevent)))
     (native-inputs

gnu/packages/base.scm

@@ -324,7 +324,7 @@ used to apply commands with arbitrarily long arguments.")
              ,@(if (and (not (%current-target-system))
                         (member (%current-system)
                                 (package-supported-systems libcap)))
-             `(("libcap" ,libcap))  ;capability support in 'ls', etc.
+             `(("libcap" ,libcap-2.31))        ;capability support in 'ls', etc.
              '())))
    (native-inputs
     ;; Perl is needed to run tests in native builds, and to run the bundled

gnu/packages/linux.scm

@@ -157,6 +157,7 @@
   #:use-module (guix store)
   #:use-module (guix monads)
   #:use-module (guix utils)
+  #:use-module (guix deprecation)    ;for libcap/next
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-2)
   #:use-module (srfi srfi-26)
@@ -2404,7 +2405,7 @@ network hardware types (plipconfig, slattach) and advanced aspects of IP
 configuration (iptunnel, ipmaddr).")
       (license license:gpl2+))))
 
-(define-public libcap
+(define-public libcap-2.31
   (package
     (name "libcap")
     (version "2.31")
@@ -2443,11 +2444,12 @@ Linux-based operating systems.")
     ;; License is BSD-3 or GPLv2, at the user's choice.
     (license license:gpl2)))
 
-;; libcap 2.31 causes problems for 'fakeroot', so provide this newer variant.
+;; libcap 2.31 has problems with newer kernels, so provide this newer variant.
+;; Keep the old libcap around to avoid rebuilding 'coreutils' and 'avahi'.
 ;; To be merged with libcap on the next rebuild cycle.
-(define-public libcap/next
+(define-public libcap
   (package
-    (inherit libcap)
+    (inherit libcap-2.31)
     (version "2.34")
     (source (origin
               (method url-fetch)
@@ -2458,6 +2460,9 @@ Linux-based operating systems.")
                (base32
                 "048n1gy2p48vl9hkrr9wymfxxcpwj2aslz2bv79nhl4m2lhd9kdf"))))))
 
+(define-deprecated libcap/next libcap)
+(export libcap/next)
+
 (define-public bridge-utils
   (package
     (name "bridge-utils")
@@ -7076,7 +7081,7 @@ the superuser to make device nodes.")
        ("xz" ,xz)))
     (inputs
      `(("acl" ,acl)
-       ("libcap" ,libcap/next)
+       ("libcap" ,libcap)
        ("util-linux" ,util-linux)
        ("sed" ,sed)
        ("coreutils" ,coreutils)))

gnu/packages/ntp.scm

@@ -81,7 +81,7 @@
      `(("pkg-config" ,pkg-config)))
     (inputs
      `(("gnutls" ,gnutls)
-       ("libcap" ,libcap/next)
+       ("libcap" ,libcap)
        ("libseccomp" ,libseccomp)
        ("nettle" ,nettle)))
     (home-page "https://chrony.tuxfamily.org/")
@@ -144,7 +144,7 @@ time-stamping or reference clock, sub-microsecond accuracy is possible.")
       ;; to run as non-root (when invoked with '-u'.)
       ,@(if (string-suffix? "-linux"
                             (or (%current-target-system) (%current-system)))
-            `(("libcap" ,libcap/next))
+            `(("libcap" ,libcap))
             '())))
    (arguments
     `(#:phases