i've hit this error when running psp-fixup-imports on one of the examples
in psgpl tests directory, in particular eglpbuffers.elf. i have been
unable to make the error go away by re-arranging libraries in the
command line passed to collect2/psp-ld, however it turned out that simply
disabling the error produced a working binary.
therefore, just make it print a fat warning and continue anyway.
this makes the output compatible with readelf, which prints hex
in lowercase (so one can e.g. readelf -a foo.elf | less and search
for some hex value in the output).
