Fix tests that are "hard coded" to expect x86_64 output by mocking the platform interface.

Submitted upstream:
https://github.com/pypa/packaging/pull/176

diff --git a/tests/test_tags.py b/tests/test_tags.py
index 1eacf68..0a3f1b4 100644
--- a/tests/test_tags.py
+++ b/tests/test_tags.py
@@ -435,37 +435,43 @@ class TestManylinuxPlatform:
         linux_platform = list(tags._linux_platforms(is_32bit=False))
         assert linux_platform == ["linux_x86_64"]
 
-    def test_linux_platforms_manylinux1(self, monkeypatch):
+    def test_linux_platforms_manylinux1(self, is_x86, monkeypatch):
         monkeypatch.setattr(
             tags, "_is_manylinux_compatible", lambda name, _: name == "manylinux1"
         )
-        if platform.system() != "Linux":
+        if platform.system() != "Linux" or not is_x86:
             monkeypatch.setattr(distutils.util, "get_platform", lambda: "linux_x86_64")
+            monkeypatch.setattr(platform, "machine", lambda: "x86_64")
         platforms = list(tags._linux_platforms(is_32bit=False))
-        assert platforms == ["manylinux1_x86_64", "linux_x86_64"]
+        arch = platform.machine()
+        assert platforms == ["manylinux1_" + arch, "linux_" + arch]
 
-    def test_linux_platforms_manylinux2010(self, monkeypatch):
+    def test_linux_platforms_manylinux2010(self, is_x86, monkeypatch):
         monkeypatch.setattr(
             tags, "_is_manylinux_compatible", lambda name, _: name == "manylinux2010"
         )
-        if platform.system() != "Linux":
+        if platform.system() != "Linux" or not is_x86:
             monkeypatch.setattr(distutils.util, "get_platform", lambda: "linux_x86_64")
+            monkeypatch.setattr(platform, "machine", lambda: "x86_64")
         platforms = list(tags._linux_platforms(is_32bit=False))
-        expected = ["manylinux2010_x86_64", "manylinux1_x86_64", "linux_x86_64"]
+        arch = platform.machine()
+        expected = ["manylinux2010_" + arch, "manylinux1_" + arch, "linux_" + arch]
         assert platforms == expected
 
-    def test_linux_platforms_manylinux2014(self, monkeypatch):
+    def test_linux_platforms_manylinux2014(self, is_x86, monkeypatch):
         monkeypatch.setattr(
             tags, "_is_manylinux_compatible", lambda name, _: name == "manylinux2014"
         )
-        if platform.system() != "Linux":
+        if platform.system() != "Linux" or not is_x86:
             monkeypatch.setattr(distutils.util, "get_platform", lambda: "linux_x86_64")
+            monkeypatch.setattr(platform, "machine", lambda: "x86_64")
         platforms = list(tags._linux_platforms(is_32bit=False))
+        arch = platform.machine()
         expected = [
-            "manylinux2014_x86_64",
-            "manylinux2010_x86_64",
-            "manylinux1_x86_64",
-            "linux_x86_64",
+            "manylinux2014_" + arch,
+            "manylinux2010_" + arch,
+            "manylinux1_" + arch,
+            "linux_" + arch,
         ]
         assert platforms == expected
 
98dfed1de935dfc60510a5514e5c289c3fc7'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-28 22:57:07 +0200'>2019-04-28</span></td><td><a href='/guix/commit/NEWS?id=7dac61143d9911ad02e239a44b17bd40f06d47a6'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-05 00:11:22 +0100'>2018-12-05</span></td><td><a href='/guix/commit/NEWS?id=eeedb094ec93ac63e92f733165a3e6883f6002ba'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-05 00:08:28 +0100'>2018-12-05</span></td><td><a href='/guix/commit/NEWS?id=273cce9875a1deba2b6669099e69824db55c9622'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-11-23 15:42:01 +0100'>2018-11-23</span></td><td><a href='/guix/commit/NEWS?id=4bd5b9707e14bd5ad4da6868687ff3c642705ce3'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-08-30 15:22:30 +0200'>2018-08-30</span></td><td><a href='/guix/commit/NEWS?id=0f377aad75314df6c6296f4172801519315d81cd'>Update NEWS.</a></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-07-05 22:16:39 +0200'>2018-07-05</span></td><td><a href='/guix/commit/NEWS?id=359fdda40f754bbf1b5dc261e7427b75463b59be'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-07-05 17:19:09 +0200'>2018-07-05</span></td><td><a href='/guix/commit/NEWS?id=1400776f529317c6c3529a0fda2b728e48a621a2'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-06-20 23:47:08 +0200'>2018-06-20</span></td><td><a href='/guix/commit/NEWS?id=414ee4edc9e6fcadba366072a7ebabf3e3c6f26a'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-29 14:05:11 +0200'>2018-05-29</span></td><td><a href='/guix/commit/NEWS?id=55a433ebb0b2deb69141619d0a0b1e298a969c36'>Update NEWS.</a></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-05-20 21:42:32 +0300'>2018-05-20</span></td><td><a href='/guix/commit/NEWS?id=e9d271ed9a1fba86f372986a137b6110a41a1324'>services: Add Enlightenment desktop service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/desktop.scm (&lt;enlightenment-desktop-configuration&gt;,
enlightenment-desktop-service-type): New variables.
* doc/guix.texi (Desktop Services): Document the service.
* NEWS: Mention it.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-05-08 21:55:46 -0700'>2018-05-08</span></td><td><a href='/guix/commit/NEWS?id=ede121de426f9c56820852888a0b370f0ccbce49'>guix: Separate the package name and version with "@", not "-".</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/packages.scm (package-full-name): By default, use "@" to separate
  the package name and package version.  Add an optional delimiter
  argument so that there is still a way to explicitly use a different
  delimiter.
* gnu/packages/commencement.scm (gcc-boot0) &lt;unpack-gmp&amp;co&gt;: Adjust
  accordingly.
* tests/graph.scm: Adjust accordingly.
* tests/profiles.scm: Adjust accordingly.
* NEWS: Mention the change.

Fixes: &lt;https://bugs.gnu.org/31088&gt;.
Reported by Pierre Neidhardt &lt;ambrevar@gmail.com&gt;.
</span></span></td><td>Chris Marusich</td></tr>