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
2a3392624bab334de66f816344ad3c40ac'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=2277552a3392624bab334de66f816344ad3c40ac'>root</a>/<a href='/guix/log/gnu?id=2277552a3392624bab334de66f816344ad3c40ac'>gnu</a>/<a href='/guix/log/gnu/packages?id=2277552a3392624bab334de66f816344ad3c40ac'>packages</a>/<a href='/guix/log/gnu/packages/mc.scm?id=2277552a3392624bab334de66f816344ad3c40ac'>mc.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/packages/mc.scm?id=2277552a3392624bab334de66f816344ad3c40ac&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-05-29 16:09:48 +0200'>2021-05-29</span></td><td><a href='/guix/commit/gnu/packages/mc.scm?id=38e8ffe25582aa9ffb5196bcd46a201571961591'>gnu: mc: Order inputs alphabetically.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-05-29 16:09:48 +0200'>2021-05-29</span></td><td><a href='/guix/commit/gnu/packages/mc.scm?id=11e4ccc6fb8f10f4d7c81e663eb4933c915572aa'>Sort module imports in (gnu packages mc).</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-05-29 16:09:48 +0200'>2021-05-29</span></td><td><a href='/guix/commit/gnu/packages/mc.scm?id=ef5c6f9097367d45225bf6ca994cd2b51153da6d'>gnu: mc: Support mice.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-02-07 23:27:15 +0100'>2021-02-07</span></td><td><a href='/guix/commit/gnu/packages/mc.scm?id=94381414101fbb83475c591b44f3d14b01947090'>gnu: mc: Update to 4.8.26.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>