Fix test that fails on i686:

https://bitbucket.org/cffi/cffi/issues/382

This is a squashed version of these commits:
https://bitbucket.org/cffi/cffi/commits/ef09637b2314
https://bitbucket.org/cffi/cffi/commits/7a76a3815340

diff -r 99940f1f5402 testing/cffi0/test_function.py
--- a/testing/cffi0/test_function.py	Tue Feb 27 21:18:33 2018 +0100
+++ b/testing/cffi0/test_function.py	Sun Nov 11 16:26:23 2018 +0100
@@ -45,14 +45,14 @@
         assert x != math.sin(1.23)    # rounding effects
         assert abs(x - math.sin(1.23)) < 1E-6
 
-    def test_sin_no_return_value(self):
+    def test_lround_no_return_value(self):
         # check that 'void'-returning functions work too
         ffi = FFI(backend=self.Backend())
         ffi.cdef("""
-            void sin(double x);
+            void lround(double x);
         """)
         m = ffi.dlopen(lib_m)
-        x = m.sin(1.23)
+        x = m.lround(1.23)
         assert x is None
 
     def test_dlopen_filename(self):
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<div class='path'>path: <a href='/guix/log/?id=5b4051bf0bba1623f81381fccd680f509c5482ed'>root</a>/<a href='/guix/log/gnu?id=5b4051bf0bba1623f81381fccd680f509c5482ed'>gnu</a>/<a href='/guix/log/gnu/tests?id=5b4051bf0bba1623f81381fccd680f509c5482ed'>tests</a>/<a href='/guix/log/gnu/tests/singularity.scm?id=5b4051bf0bba1623f81381fccd680f509c5482ed'>singularity.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/tests/singularity.scm?id=5b4051bf0bba1623f81381fccd680f509c5482ed&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-11-09 23:04:14 +0100'>2019-11-09</span></td><td><a href='/guix/commit/gnu/tests/singularity.scm?id=f0034427f50be1bcab137d9877c3586e4be4d83e'>tests: Update references to the now-deprecated 'guile-json' variable.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/docker.scm (build-tarball&amp;run-docker-test): Refer to
'guile-json-3' instead of 'guile-json'.
* gnu/tests/singularity.scm (build-tarball&amp;run-singularity-test):
Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-07-04 18:05:02 +0200'>2019-07-04</span></td><td><a href='/guix/commit/gnu/tests/singularity.scm?id=dea62932bc929243dae5e8b08f4fbe0b6f70be95'>pack: 'squashfs' backend records the profile's search paths.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/pack.scm (singularity-environment-file): New procedure.
(squashfs-image): Use it, and create /.singularity/env/90-environment.sh.
* gnu/tests/singularity.scm (run-singularity-test)["singularity run,
with environment"]: New test, currently skipped.
* gnu/tests/singularity.scm (build-tarball&amp;run-singularity-test): Add
GUILE-JSON to the profile.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-06-07 09:57:19 +0200'>2019-06-07</span></td><td><a href='/guix/commit/gnu/tests/singularity.scm?id=a0f352b30f4869a7af7017b8a5011ac7602dd115'>pack: Add '--entry-point'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/pack.scm (self-contained-tarball): Add #:entry-point and
warn when it's true.
(squashfs-image): Add #:entry-point and honor it.
(docker-image): Add #:entry-point and honor it.
(%options, show-help): Add '--entry-point'.
(guix-pack): Honor '--entry-point' and pass #:entry-point to BUILD-IMAGE.
* gnu/tests/docker.scm (run-docker-test): Test 'docker run' with the
default entry point.
(build-tarball&amp;run-docker-test): Pass #:entry-point to 'docker-image'.
* doc/guix.texi (Invoking guix pack): Document it.
* gnu/tests/singularity.scm (run-singularity-test)["singularity run"]:
New test.
(build-tarball&amp;run-singularity-test): Pass #:entry-point to
'squashfs-image'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-06-07 09:57:19 +0200'>2019-06-07</span></td><td><a href='/guix/commit/gnu/tests/singularity.scm?id=08814aec6ae75adcd059c5235c90ad26e5d5607e'>services: Add Singularity.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/linux.scm (singularity)[source](snippet): Change file
name of setuid helpers in libexec/cli/*.exec.
[arguments]: Remove "--disable-suid".
* gnu/services/docker.scm (%singularity-activation): New variable.
(singularity-setuid-programs): New procedure.
(singularity-service-type): New variable.
* gnu/tests/singularity.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Miscellaneous Services): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>