gnu: olm: Drop custom ‘lib-’ prefix.

* gnu/packages/crypto.scm (olm): New variable, renamed from…
(libolm): …this one, which is now a DEPRECATED-PACKAGE alias of olm.
Adjust all users.
[synopsis, description]: Adjust.  Capitalise proper nouns.
(python-olm)[description]: Remove implementation detail.

gnu/packages/crypto.scm

@@ -1293,9 +1293,9 @@ (define-public minisign
 Trusted comments are signed, thus verified, before being displayed.")
     (license license:isc)))
 
-(define-public libolm
+(define-public olm
   (package
-    (name "libolm")
+    (name "olm")
     (version "3.2.12")
     (source (origin
               (method git-fetch)
@@ -1319,13 +1319,16 @@ (define-public libolm
              (when tests?
                (with-directory-excursion "tests"
                  (invoke "ctest" "."))))))))
-    (synopsis "Implementation of the olm and megolm cryptographic ratchets")
-    (description "The libolm library implements the Double Ratchet
+    (synopsis "Implementation of the Olm and Megolm cryptographic ratchets")
+    (description "The Olm library implements the Double Ratchet
 cryptographic ratchet.  It is written in C and C++11, and exposed as a C
 API.")
     (home-page "https://matrix.org/docs/projects/other/olm/")
     (license license:asl2.0)))
 
+(define-public libolm
+  (deprecated-package "libolm" olm))
+
 (define-public python-olm
   (package
     ;; python-olm is part of libolm and must be updated at the same time.
@@ -1351,10 +1354,9 @@ (define-public python-olm
      (list python-cffi python-future))
     (native-inputs
      (list python-pytest python-pytest-benchmark python-aspectlib))
-    (synopsis "Python bindings for libolm")
-    (description "The libolm library implements the Double Ratchet
-cryptographic ratchet.  It is written in C and C++11, and exposed as a C
-API.  This package contains its Python bindings.")))
+    (synopsis "Python bindings for Olm")
+    (description "The Olm library implements the Double Ratchet
+cryptographic ratchet.  This package contains its Python bindings.")))
 
 (define-public hash-extender
   (let ((commit "cb8aaee49f93e9c0d2f03eb3cafb429c9eed723d")

gnu/packages/messaging.scm

@@ -2380,7 +2380,7 @@ (define-public mtxclient
            curl
            json-modern-cxx
            libevent
-           libolm
+           olm
            libsodium
            openssl
            spdlog
@@ -2463,7 +2463,7 @@ (define-public nheko
            json-modern-cxx
            libevent
            libnice                      ; for voip
-           libolm
+           olm
            lmdb
            lmdbxx
            mtxclient
@@ -2884,7 +2884,7 @@ (define-public chatty
            libgcrypt
            libgee
            libhandy
-           libolm
+           olm
            libphonenumber
            modem-manager
            pidgin