make scalar only emit complex-related code when complex type is in use.

theano/scalar/basic.py

@@ -175,6 +175,9 @@ class Scalar(Type):
         return ""
 
     def c_support_code(self):
+
+        if self.dtype.startswith('complex'):
+
             template = """
             struct theano_complex%(nbits)s : public npy_complex%(nbits)s
             {
@@ -281,6 +284,10 @@ class Scalar(Type):
                     + operator_eq % dict(mytype='theano_complex128') \
                     + operator_eq % dict(mytype='theano_complex64')
 
+        else:
+
+            return ""
+
     def c_code_cache_version(self):
         # no need to put lib.amdlibm here as c_compile_args() are put in the key.
         return (6,)  # added implemeentations of operators that work with scalar arguments