package/elf2flt: remove broken patch

Remove broken elf2flt patch:
package/elf2flt/0003-elf2flt-fix-.eh_frame-section-handling.patch

The patch modifies main(), but does not perform a similar change in
output_relocs(), which might cause sectionp in output_relocs() to be
initialized with an invalid address, causing random memory to be
overwritten.

This leads to a segfault when linking e.g. busybox for m68k.

We cannot perform a similar change in output_relocs(), since at this
point in time, data_len will always be non-zero.

Revert this patch completely, so that we can add a working patch.

Note that even with this patch reverted, elf2flt is still broken
on archs like m68k and xtensa, resulting in the fatal error:
ERROR: text=0x3bab8 overlaps data=0x33f60 ?

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>