Use global defines for `Rational` and `Complex`.

mrbgems/mruby-complex/mrbgem.rake

@@ -2,6 +2,6 @@ MRuby::Gem::Specification.new('mruby-complex') do |spec|
   spec.license = 'MIT'
   spec.author  = 'mruby developers'
   spec.summary = 'Complex class'
-  spec.build.cc.defines << "MRB_USE_COMPLEX"
+  spec.build.defines << "MRB_USE_COMPLEX"
   spec.add_dependency 'mruby-math', core: 'mruby-math'
 end

mrbgems/mruby-rational/mrbgem.rake

@@ -2,5 +2,5 @@ MRuby::Gem::Specification.new('mruby-rational') do |spec|
   spec.license = 'MIT'
   spec.author  = 'mruby developers'
   spec.summary = 'Rational class'
-  spec.build.cc.defines << "MRB_USE_RATIONAL"
+  spec.build.defines << "MRB_USE_RATIONAL"
 end

mrbgems/mruby-rational/src/rational.c

@@ -379,9 +379,10 @@ mrb_rational_eq(mrb_state *mrb, mrb_value x, mrb_value y)
       }
       return a == b;
     }
+
 #ifdef MRB_USE_COMPLEX
   case MRB_TT_COMPLEX:
-    {
+   {
       mrb_bool mrb_complex_eq(mrb_state *mrb, mrb_value, mrb_value);
       return mrb_complex_eq(mrb, y, x);
     }