gnu: Remove now unneeded 'unpack' phases for unzip.

This is a followup to commit cd0385b.

* gnu/packages/bioinformatics.scm (hisat)[arguments]: Remove 'unpack'
  phase.
* gnu/packages/image.scm (freeimage): Likewise.
* gnu/packages/python.scm (python2-cssutils): Likewise.

gnu/packages/bioinformatics.scm

@@ -265,11 +265,6 @@ Illumina, Roche 454, and the SOLiD platform.")
                             '()
                             '("POPCNT_CAPABILITY=0")))
        #:phases
-       (alist-replace
-        'unpack
-        (lambda* (#:key source #:allow-other-keys)
-          (and (zero? (system* "unzip" source))
-               (chdir "hisat-0.1.4-beta")))
        (alist-cons-after
         'unpack 'patch-sources
         (lambda _
@@ -293,7 +288,7 @@ Illumina, Roche 454, and the SOLiD platform.")
               (find-files
                "."
                "hisat(-(build|align|inspect)(-(s|l)(-debug)*)*)*$"))))
-          (alist-delete 'configure %standard-phases))))))
+         (alist-delete 'configure %standard-phases)))))
     (native-inputs
      `(("unzip" ,unzip)))
     (inputs

gnu/packages/image.scm

@@ -385,12 +385,7 @@ supplies a generic doubly-linked list and some string functions.")
               "0q1gnjnxgphsh4l8i9rfly4bi8xsczsb9ryzbm8hf38lc3fk5bq3"))))
    (build-system gnu-build-system)
    (arguments
-    '(#:phases (alist-replace
-                'unpack
-                (lambda* (#:key source #:allow-other-keys)
-                  (and (zero? (system* "unzip" source))
-                       (chdir "FreeImage")))
-                (alist-delete
+    '(#:phases (alist-delete
                 'configure
                 (alist-cons-before
                  'build 'patch-makefile
@@ -398,7 +393,7 @@ supplies a generic doubly-linked list and some string functions.")
                    (substitute* "Makefile.gnu"
                      (("/usr") (assoc-ref outputs "out"))
                      (("-o root -g root") "")))
-                  %standard-phases)))
+                 %standard-phases))
       #:make-flags '("CC=gcc")
       #:tests? #f)) ; no check target
    (native-inputs

gnu/packages/python.scm

@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
-;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2013, 2014, 2015 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
@@ -3129,13 +3129,7 @@ capabilities to the Python interpreter.")
     (arguments
      `(#:python ,python-2 ; Otherwise tests fail with a syntax error.
        #:tests? #f ; The tests apparently download an external URL.
-       #:phases
-       (alist-replace
-        'unpack
-        (lambda* (#:key source #:allow-other-keys)
-          (and (zero? (system* "unzip" source))
-               (chdir "cssutils-1.0")))
-        %standard-phases)))
+       ))
     (home-page "http://cthedot.de/cssutils/")
     (synopsis
       "CSS Cascading Style Sheets library for Python")