gnu: go-github-com-cespare-xxhash: Rename variable.

* gnu/packages/golang-crypto.scm (go-github-com-cespare-xxhash):
Rename to go-github-com-cespare-xxhash-v2 to reflect go.mod import path.
* gnu/packages/golang-xyz.scm (go-github-com-coocood-freecache)
[propagated-inputs]: Remove go-github-com-cespare-xxhash, add
go-github-com-cespare-xxhash-v2.
* gnu/packages/networking.scm (nebula) [native-inputs]: Remove
go-github-com-cespare-xxhash, add go-github-com-cespare-xxhash-v2.
* gnu/packages/textutils.scm (csvdiff): Likewise.

Change-Id: I4d26cea51178d25962933ff6f19f0afafef61d6d

gnu/packages/golang-crypto.scm

@@ -355,9 +355,9 @@ needing to use secp256k1 elliptic curve cryptography.")
 the Ristretto prime-order group built from Edwards25519.")
     (license license:expat)))
 
-(define-public go-github-com-cespare-xxhash
+(define-public go-github-com-cespare-xxhash-v2
   (package
-    (name "go-github-com-cespare-xxhash")
+    (name "go-github-com-cespare-xxhash-v2")
     (version "2.1.2")
     (source
      (origin
@@ -373,7 +373,7 @@ the Ristretto prime-order group built from Edwards25519.")
     (build-system go-build-system)
     (arguments
      (list
-      #:import-path "github.com/cespare/xxhash"
+      #:import-path "github.com/cespare/xxhash/v2"
       #:phases
       #~(modify-phases %standard-phases
           (replace 'check

gnu/packages/golang-xyz.scm

@@ -1237,7 +1237,7 @@ levels that works by wrapping the standard @code{log} library.")
     (arguments
      (list
       #:import-path "github.com/coocood/freecache"))
-    (propagated-inputs (list go-github-com-cespare-xxhash))
+    (propagated-inputs (list go-github-com-cespare-xxhash-v2))
     (home-page "https://github.com/coocood/freecache")
     (synopsis "Caching library for Go")
     (description

gnu/packages/networking.scm

@@ -4750,7 +4750,7 @@ IPv6 Internet connectivity - it also works over IPv4.")
      (list go-dario-cat-mergo
            go-github-com-anmitsu-go-shlex
            go-github-com-armon-go-radix
-           go-github-com-cespare-xxhash
+           go-github-com-cespare-xxhash-v2
            go-github-com-cyberdelia-go-metrics-graphite
            go-github-com-flynn-noise
            go-github-com-gogo-protobuf

gnu/packages/textutils.scm

@@ -1589,7 +1589,7 @@ files for valid UTF-8 use and to report which line endings they use.")
       #:install-source? #f
       #:import-path "github.com/aswinkarthik/csvdiff"))
     (native-inputs
-     (list go-github-com-cespare-xxhash
+     (list go-github-com-cespare-xxhash-v2
            go-github-com-fatih-color
            go-github-com-spf13-afero
            go-github-com-spf13-cobra