Add SPI results constants available for PL/*

I'm using PL/Python, and when getting the result object from a
plpy.execute(), I can access to the result.status().

E.g.: the result.status() is 4. But to know what 4 corresponds to, I must
open the "spi.h" file from the sources to see :

#define SPI_OK_CONNECT 1
#define SPI_OK_FINISH 2
#define SPI_OK_FETCH 3
#define SPI_OK_UTILITY 4
#define SPI_OK_SELECT 5
#define SPI_OK_SELINTO 6
#define SPI_OK_INSERT 7
#define SPI_OK_DELETE 8
#define SPI_OK_UPDATE 9
#define SPI_OK_CURSOR 10
#define SPI_OK_INSERT_RETURNING 11
#define SPI_OK_DELETE_RETURNING 12
#define SPI_OK_UPDATE_RETURNING 13
#define SPI_OK_REWRITTEN 14

Is there a way to have access to these constants from the PL/python code
and other PL/* (Tcl, Perl, etc.) ?

Thanks,

--
Samuel PHAN