Removing a symbol from Symbol.map?

In my journey through the libm source code, I've discovered
that msun/src/w_cabs.c contains a function named z_abs.  This
symbol appears in libm's Symbol.map, but z_abs has not prototype
in any header file under /usr/include.  Thus, it is namespace
pollution that I'd like to remove.  Do I simply remove z_abs from
Symbol.map or is there more to it then this?
 
PS: Yes, I know bde will probably object to removal of z_abs
because of compatibility issues with fdlibm and the other *BSD.

-- 
Steve