It might not be easy, due to the clunky mess that is FSF/GNU source code. To explain where this symbol comes from:

In order to facilitate I/O multiplexing, POSIX has the select function. You bundle a few file descriptors in an fd_set structure, call select on it, and when it returns, you'll know which file descriptor from the set is readable and/or writable.

To manipulate the fd_set structure, there are a few of macros available in <sys/select.h>. From misc/sys/select.h:

#define FD_SET(fd, fdsetp)  __FD_SET (fd, fdsetp)
#define FD_CLR(fd, fdsetp)  __FD_CLR (fd, fdsetp)
#define FD_ISSET(fd, fdsetp)    __FD_ISSET (fd, fdsetp)

These macros are defined in bits/select.h:

#define __FD_SET(d, s) \
  ((void) (__FDS_BITS (s)[__FD_ELT(d)] |= __FD_MASK(d)))
#define __FD_CLR(d, s) \
  ((void) (__FDS_BITS (s)[__FD_ELT(d)] &= ~__FD_MASK(d)))
#define __FD_ISSET(d, s) \
  ((__FDS_BITS (s)[__FD_ELT (d)] & __FD_MASK (d)) != 0)    

Unless you've disabled fortification, __FD_ELT is defined in misc/bits/select2.h:

#undef __FD_ELT
#define __FD_ELT(d) \
  __extension__                                 \
  ({ long int __d = (d);                            \
     (__builtin_constant_p (__d)                        \
      ? (0 <= __d && __d < __FD_SETSIZE                     \
     ? (__d / __NFDBITS)                            \
     : __fdelt_warn (__d))                          \
      : __fdelt_chk (__d)); })

In case compile-time checking fails, a run-time check is used. debug/fdelt_chk.c:

long int
__fdelt_chk (long int d)
{
  if (d < 0 || d >= FD_SETSIZE)
    __chk_fail ();

  return d / __NFDBITS;
}

This redefinition is activated in <misc/sys/select.h> when fortification is enabled:

#if __USE_FORTIFY_LEVEL > 0 && defined __GNUC__
# include <bits/select2.h>
#endif

One approach be to disable fortification when compiling libcef. Not the best idea, but you'll probably lose all imports of the *_chk functions. These functions will make the program crash and burn when a security condition is violated. When disabled, the behaviour is undefined.

Another approach might be to find where the FD_* macros are used (I couldn't find it, perhaps it's in a library libcef uses), and replace them with less portable code. Or drop fdelt_chk.c in that part of the source tree.

That's completely understandable, since you're not targeting Debian. Close as wontfix then?