[UserProjectIntegrator] Config values are returned as arrays.

Fix for 52c2f915.

lib/cocoapods/installer/user_project_integrator.rb

@@ -144,7 +144,7 @@ module Pod
               if xcconfig
                 xcconfig.to_hash.keys.each do |key|
                   target_value = config.build_settings[key]
-                  if target_value && target_value !~ /\$[({]inherited[})]/
+                  if target_value && target_value.grep(/\$[({]inherited[})]/).empty?
                     print_override_warning(aggregate_target, user_target, config, key)
                   end
                 end

spec/unit/installer/user_project_integrator_spec.rb

@@ -57,7 +57,7 @@ module Pod
 
         it 'check that the integrated target does not override the CocoaPods build settings' do
           UI.warnings = ''
-          target_config = stub(:name => 'Release', :build_settings => { 'GCC_PREPROCESSOR_DEFINITIONS' => 'FLAG=1' })
+          target_config = stub(:name => 'Release', :build_settings => { 'GCC_PREPROCESSOR_DEFINITIONS' => ['FLAG=1'] })
           user_target = stub(:name => 'SampleProject', :build_configurations => [target_config])
           @library.stubs(:user_targets).returns([user_target])
 
@@ -72,7 +72,7 @@ module Pod
 
         it 'allows the use of the alternate form of the inherited flag' do
           UI.warnings = ''
-          target_config = stub(:name => 'Release', :build_settings => { 'GCC_PREPROCESSOR_DEFINITIONS' => 'FLAG=1 ${inherited}' })
+          target_config = stub(:name => 'Release', :build_settings => { 'GCC_PREPROCESSOR_DEFINITIONS' => ['FLAG=1', '${inherited}'] })
           user_target = stub(:name => 'SampleProject', :build_configurations => [target_config])
           @library.stubs(:user_targets).returns([user_target])
 
@@ -86,7 +86,7 @@ module Pod
 
         it 'allows build settings which inherit the settings form the CocoaPods xcconfig' do
           UI.warnings = ''
-          target_config = stub(:name => 'Release', :build_settings => { 'GCC_PREPROCESSOR_DEFINITIONS' => 'FLAG=1 $(inherited)' })
+          target_config = stub(:name => 'Release', :build_settings => { 'GCC_PREPROCESSOR_DEFINITIONS' => ['FLAG=1', '$(inherited)'] })
           user_target = stub(:name => 'SampleProject', :build_configurations => [target_config])
           @library.stubs(:user_targets).returns([user_target])