gnu: pcre: Remove now-unneeded replacement.

* gnu/packages/pcre.scm (pcre)[replacement]: Remove.
(pcre-fixed): Remove.

gnu/packages/pcre.scm

@@ -31,7 +31,6 @@
   (package
    (name "pcre")
    (version "8.38")
-   (replacement pcre-fixed)
    (source (origin
             (method url-fetch)
             (uri (list
@@ -70,13 +69,6 @@ POSIX regular expression API.")
    (license license:bsd-3)
    (home-page "http://www.pcre.org/")))
 
-(define pcre-fixed                                ;for CVE-2016-3191
-  (package
-    (inherit pcre)
-    (source (origin
-              (inherit (package-source pcre))
-              (patches (search-patches "pcre-CVE-2016-3191.patch"))))))
-
 (define-public pcre2
   (package
     (name "pcre2")