gnu: go-github-com-spf13-pflag: Move to golang-xyz.

* gnu/packages/golang.scm (go-github-com-spf13-pflag): Move from here ...
* gnu/packages/golang-xyz.scm: ... to here.

Change-Id: I15be5ebbc1b2c200267676ae0c8b88fc2e062e85

gnu/packages/golang.scm

@@ -3179,44 +3179,6 @@ information about the resource usage and performance characteristics of running
 containers.")
       (license license:asl2.0))))
 
-;; XXX: Not maintained for 3y, see
-;; <https://github.com/spf13/pflag/issues/385>.
-(define-public go-github-com-spf13-pflag
-  (package
-    (name "go-github-com-spf13-pflag")
-    (version "1.0.5")
-    (source
-      (origin
-        (method git-fetch)
-        (uri (git-reference
-               (url "https://github.com/spf13/pflag")
-               (commit (string-append "v" version))))
-        (file-name (git-file-name name version))
-        (sha256
-         (base32
-          "0gpmacngd0gpslnbkzi263f5ishigzgh6pbdv9hp092rnjl4nd31"))
-        (snippet
-         #~(begin
-             (use-modules (guix build utils))
-             ;; Fix compatibility with go-1.19+
-             ;; https://github.com/spf13/pflag/issues/368
-             (substitute* "flag_test.go"
-               (("fmt\\.Println") "fmt.Print")
-               (("\\+ got\\)") "+ got + \"\\n\")")
-               (("\\+ defaultOutput\\)") "+ defaultOutput + \"\\n\")"))))))
-    (build-system go-build-system)
-    (arguments
-      '(#:import-path "github.com/spf13/pflag"))
-    (home-page "https://github.com/spf13/pflag")
-    (synopsis "Replacement for Go's @code{flag} package")
-    (description
-     "Pflag is library to replace Go's @code{flag} package.  It implements
-POSIX/GNU-style command-line options with double hyphens.  It is is compatible
-with the
-@uref{https://www.gnu.org/software/libc/manual/html_node/Argument-Syntax.html,
-GNU extensions} to the POSIX recommendations for command-line options.")
-    (license license:bsd-3)))
-
 (define-public go-github-com-spf13-viper
   (package
     (name "go-github-com-spf13-viper")