package/elf2flt: remove backported patch

package/elf2flt: remove backported patch

The patch added by [1] to fix a segfault with elf2flt when binutils
2.33.1 is used on ARM, introduce a regression with previous binutils
version on m68k and ARM.

Theses issues has been reported upstream [2] [3] but there is no
definitive solution.

The binutils 2.33.1 has been disabled for configurations using
BR2_BINFMT_FLAT by the previous commit, so we can safely remove
the patch.

Fixes:
[acpica-20191018]
http://autobuild.buildroot.net/results/81ee33eb606062a62765d95b66a26f130d280c53
[augeas-1.12.0]
http://autobuild.buildroot.net/results/4e1f7f335d2c853e2a5e6ad96c14157ba8f003c7
[cairo-1.16.0]
http://autobuild.buildroot.net/results/976d99bc9b052f8d9429e666ac7fff7768ffff6b
[fontconfig-2.13.1]
http://autobuild.buildroot.net/results/4a5a8cb6411d709acb7ea8c83b3c8e45fdc0a10b
[gptfdisk-1.0.4]
http://autobuild.buildroot.net/results/6db5f9d8663730a54b04c1e624438095598b2573
[libopenssl-1.1.1d]
http://autobuild.buildroot.net/results/acf87e81130e85e7fb05edf5f6dedf095f16e226
[mimic-1.1.0]
http://autobuild.buildroot.net/results/61f53630ed85ee0d0d6dbf71012db77f4d7986ad
Maybe more...

[1] 2b064f86b6a0fd683f307b51f12d9d919fcaa386
[2] https://github.com/uclinux-dev/elf2flt/pull/16
[3] https://github.com/uclinux-dev/elf2flt/issues/12

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>