bug#43274: fdisk fails to build on armhf

[Andreas Enge]

Here is what happens when I drop fdisk from native-inputs of genimage:

starting phase `check'
make --no-print-directory check-TESTS
PASS: test/basic-images.test 1 - cpio
SKIP: test/basic-images.test 2 # SKIP cramfs (missing mkcramfs)
...
PASS: test/basic-images.test 20 - fit
============================================================================
Testsuite summary for genimage 11
============================================================================
# TOTAL: 20
# PASS:  19
# SKIP:  1
# XFAIL: 0
# FAIL:  0
# XPASS: 0
# ERROR: 0

So there does not even seem to be a test that relies on fdisk.

I would suggest to drop fdisk from this package (and getting closer to
dropping guile@1.8 as well).

Andreas