tools: format like func.pyx.

Author: mrjbq7

tools/generate.py

@@ -53,8 +53,6 @@
 
 from .common cimport _ta_check_success
 
-ctypedef int TA_RetCode
-
 cdef double NaN = nan
 
 cdef extern from "numpy/arrayobject.h":
@@ -66,6 +64,7 @@
 np.import_array() # Initialize the NumPy C API
 
 cimport libc as lib
+from libc cimport TA_RetCode
 """)
 
 # cleanup variable names to make them more pythonic