gnu: multipath-tools: Remove Ceph input.

Ceph adds a massive dependency for a little-used feature.  It was mainly added
because the build-system previously could not cope with librados being missing.

* gnu/packages/linux.scm (multipath-tools)[inputs]: Remove CEPH:LIB.

gnu/packages/linux.scm

@@ -105,7 +105,6 @@
   #:use-module (gnu packages samba)
   #:use-module (gnu packages serialization)
   #:use-module (gnu packages slang)
-  #:use-module (gnu packages storage)
   #:use-module (gnu packages texinfo)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages valgrind)
@@ -3302,8 +3301,7 @@ arrays when needed.")
        ("pkg-config" ,pkg-config)
        ("valgrind" ,valgrind)))
     (inputs
-     `(("ceph:lib" ,ceph "lib")
-       ("json-c" ,json-c)
+     `(("json-c" ,json-c)
        ("libaio" ,libaio)
        ("liburcu" ,liburcu)
        ("lvm2" ,lvm2)