Add UNITY_OUTPUT_CHAR_HEADER_DECLARATION to fixture tests rakefile_helper.rb

extras/fixture/rakefile_helper.rb

@@ -53,7 +53,7 @@ module RakefileHelpers
     defines = if $cfg['compiler']['defines']['items'].nil?
                 ''
               else
-                squash($cfg['compiler']['defines']['prefix'], $cfg['compiler']['defines']['items'] + ['UNITY_OUTPUT_CHAR=UnityOutputCharSpy_OutputChar'])
+                squash($cfg['compiler']['defines']['prefix'], $cfg['compiler']['defines']['items'] + ['UNITY_OUTPUT_CHAR=UnityOutputCharSpy_OutputChar'] + ['UNITY_OUTPUT_CHAR_HEADER_DECLARATION=UnityOutputCharSpy_OutputChar\(int\)'])
               end
     options  = squash('', $cfg['compiler']['options'])
     includes = squash($cfg['compiler']['includes']['prefix'], $cfg['compiler']['includes']['items'])