libfdisk: add sample-fdisk-mkpart binary

libfdisk: add sample-fdisk-mkpart binary

For example:
	# sample-fdisk-mkpart --device /dev/sdc 1M 2M 3M - 5M

	# fdisk -l /dev/sdc
	...
	Device     Boot Start    End Sectors Size Id Type
	/dev/sdc1        2048   4095    2048   1M 83 Linux
	/dev/sdc2        4096   8191    4096   2M 83 Linux
	/dev/sdc3        8192  14335    6144   3M 83 Linux
	/dev/sdc4       14336 204799  190464  93M  5 Extended
	/dev/sdc5       16384  26623   10240   5M 83 Linux

Addresses: https://github.com/karelzak/util-linux/issues/204
Signed-off-by: Karel Zak <kzak@redhat.com>