Work around two test suite failures on ARM:

  https://github.com/ruby-concurrency/concurrent-ruby/issues/547

The regexps here assume addresses like "0x1234" but on ARM (32-bit)
we get something like "0x-7db1e810" (notice the dash).

diff --git a/spec/concurrent/edge/promises_spec.rb b/spec/concurrent/edge/promises_spec.rb
index 727210f..149f7cd 100644
--- a/spec/concurrent/edge/promises_spec.rb
+++ b/spec/concurrent/edge/promises_spec.rb
@@ -371,9 +371,9 @@ describe 'Concurrent::Promises' do
       four  = three.delay.then(&:succ)
 
       # meaningful to_s and inspect defined for Future and Promise
-      expect(head.to_s).to match /<#Concurrent::Promises::Future:0x[\da-f]+ pending>/
+      expect(head.to_s).to match /<#Concurrent::Promises::Future:0x-?[\da-f]+ pending>/
       expect(head.inspect).to(
-          match(/<#Concurrent::Promises::Future:0x[\da-f]+ pending>/))
+          match(/<#Concurrent::Promises::Future:0x-?[\da-f]+ pending>/))
 
       # evaluates only up to three, four is left unevaluated
       expect(three.value!).to eq 3
diff --git a/spec/concurrent/map_spec.rb b/spec/concurrent/map_spec.rb
index c4050be..0a9095d 100644
--- a/spec/concurrent/map_spec.rb
+++ b/spec/concurrent/map_spec.rb
@@ -794,7 +794,7 @@ module Concurrent
     end
 
     it '#inspect' do
-      regexp = /\A#<Concurrent::Map:0x[0-9a-f]+ entries=[0-9]+ default_proc=.*>\Z/i
+      regexp = /\A#<Concurrent::Map:0x-?[0-9a-f]+ entries=[0-9]+ default_proc=.*>\Z/i
       expect(Concurrent::Map.new.inspect).to match(regexp)
       expect((Concurrent::Map.new {}).inspect).to match(regexp)
       map = Concurrent::Map.new
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<div class='path'>path: <a href='/guix/log/?id=654f997d98fd96c0a2eaa36e0dda1518eb40fb90'>root</a>/<a href='/guix/log/gnu?id=654f997d98fd96c0a2eaa36e0dda1518eb40fb90'>gnu</a>/<a href='/guix/log/gnu/installer?id=654f997d98fd96c0a2eaa36e0dda1518eb40fb90'>installer</a>/<a href='/guix/log/gnu/installer/steps.scm?id=654f997d98fd96c0a2eaa36e0dda1518eb40fb90'>steps.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/installer/steps.scm?id=654f997d98fd96c0a2eaa36e0dda1518eb40fb90&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-03-05 23:40:22 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=63b8c089c1596cd3e814ac13e1a8b3fa45bb2b54'>installer: Implement a dialog on /var/guix/installer-socket.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-02-22 00:45:42 +0100'>2020-02-22</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=5c04b00cf463a543b8ffc9eb55991f6b4cc145dd'>installer: Log important bits to syslog.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-05-06 23:21:33 +0200'>2019-05-06</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=7ae9979cff98d7c23fc8d19e54ae733ee1a7deb2'>installer: Actually translate step descriptions.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-21 12:12:11 +0200'>2019-04-21</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=33023baac8ec548fe64ce8e4eb48840b5411ee4c'>installer: Fix skip-to-step issue.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-04-08 10:42:51 +0200'>2019-04-08</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=469e56b4afc7a6bfdc070faf162f9fed42eca1d5'>installer: Generate 'set-xorg-configuration' snippet.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-07 18:02:39 +0200'>2019-04-07</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=7d1030a63592aa2f94f6617786f22cfa83fb346f'>installer: Add dialog to select networking services.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-17 14:04:22 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=dc5f3275ecbddc804875899e9e457299a835d7ab'>installer: Add configuration formatter.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:04:20 +0100'>2019-01-17</span></td><td><a href='/guix/commit/gnu/installer/steps.scm?id=d0f3a672dcbdfefd3556b6a21985ff0e35eed3be'>gnu: Add graphical installer support.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>