For Travis - use alternative way to detect make's time up.

Do not rely on the actual exit code from GNU make because it appears the code is different between Linux version and Darwin version.
[ci only: OSX] [skip appveyor]

Rakefile

@@ -80,8 +80,7 @@ task :cmake do
     ccache_envvar = ENV['CCACHE_SLOPPINESS'] ? '' : 'CCACHE_SLOPPINESS=pch_defines,time_macros'   # Only attempt to do the right thing when user hasn't done it
     ccache_envvar = "#{ccache_envvar} CCACHE_COMPRESS=1" unless ENV['CCACHE_COMPRESS']
   end
-  system "#{ccache_envvar} ./#{script}#{ENV['OS'] ? '.bat' : '.sh'} \"#{build_tree}\" #{build_options}"
-  exit $?.exitstatus
+  system "#{ccache_envvar} ./#{script}#{ENV['OS'] ? '.bat' : '.sh'} \"#{build_tree}\" #{build_options}" or abort
 end
 
 # Usage: rake make [<platform>] [<option>=<value> [<option>=<value>]] [[<platform>_]build_tree=/path/to/build-tree] [numjobs=n] [clean_first] [unfilter]
@@ -168,8 +167,7 @@ task :make do
     build_options = "-j#{numjobs}#{build_options}"
     filter = ''
   end
-  system "cd \"#{build_tree}\" && #{ccache_envvar} cmake --build . #{cmake_build_options} -- #{build_options} #{filter}"
-  exit $?.exitstatus
+  system "cd \"#{build_tree}\" && #{ccache_envvar} cmake --build . #{cmake_build_options} -- #{build_options} #{filter}" or abort
 end
 
 # Usage: rake android [parameter='--es pickedLibrary Urho3DPlayer:Scripts/NinjaSnowWar.as'] [intent=.SampleLauncher] [package=com.github.urho3d] [success_indicator='Initialized engine'] [payload='sleep 30'] [api=21] [abi=armeabi-v7a] [avd=test_#{api}_#{abi}] [retries=10] [retry_interval=10] [install]
@@ -353,7 +351,7 @@ task :ci do
     next
   end
   if !system "bash -c 'rake make'"
-    abort 'Failed to build Urho3D library' unless $?.exitstatus == 2 && timeup
+    abort 'Failed to build Urho3D library' unless File.exists?('already_timeup.log')
     $stderr.puts "Skipped the rest of the CI processes due to insufficient time"
     next
   end