libparted: use gperf-generated lookup function

libparted: use gperf-generated lookup function

* libparted/labels/pt-tools.c (ptt_partition_max_start_len):
Rewrite to use the gperf-generated look-up function.
(ptt_partition_max_start_sector): New function.
(ptt_partition_max_length): New function.
* libparted/labels/pt-tools.h: Declare them.
* libparted/labels/Makefile.am (GPERF, GPERF_OPTIONS): Define.
(BUILT_SOURCES): Define.
(liblabels_la_SOURCES): Append pt-limit.gperf.
(pt-limit.c): New rule.
(MAINTAINERCLEANFILES): Remove useless definition.
(DISTCLEANFILES): Set to $(BUILT_SOURCES).
* libparted/labels/pt-limit.gperf: New file.
* cfg.mk (bootstrap-tools): Mention gperf.
* bootstrap.conf (buildreq): Require gperf-3.0.3.