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
</option>
<option value='author'>author</option>
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<div class='path'>path: <a href='/guix/log/?id=4a1550516ab7d90864f93f2e4ad2aefb5fc18d11'>root</a>/<a href='/guix/log/gnu.scm?id=4a1550516ab7d90864f93f2e4ad2aefb5fc18d11'>gnu.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.scm?id=4a1550516ab7d90864f93f2e4ad2aefb5fc18d11&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-25 19:11:37 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu.scm?id=d51bfe242fbe6f3f8f71d723e8fe0c7bbe711ba1'>Use 'formatted-message' instead of '&amp;message' where appropriate.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-07-25 19:11:36 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu.scm?id=f9a8dd053c4e0fd1fc4b64291bb90de36520b3bc'>utils: Move '&amp;fix-hint' to (guix diagnostics).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-07-25 19:11:36 +0200'>2020-07-25</span></td><td><a href='/guix/commit/gnu.scm?id=a5e2fc73760a2ae023f2e56bdbf8025971f90e64'>utils: Move &lt;location&gt; and '&amp;error-location' to (guix diagnostics).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-24 23:06:11 +0100'>2019-03-24</span></td><td><a href='/guix/commit/gnu.scm?id=db1e2522f6222594fc507ce7a7ba7b1c0ac5037d'>Add (gnu system keyboard).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>