0.7.2:

The purpose of this patch release, with only four small changes since the
previous tagged release, is to accelerate testing of slibtool and slibtoolize
integration on Adelie Linux.

m4/slibtool.m4: SLIBTOOL: avoid a trailing space when SLIBTOOL_FLAGS is not set.
m4/slibtool.m4: AR, NM, RANLIB: special-case identical ${build} and ${host}.
slbt_init_host_params(): --mkvars=... code path: enable heuristics as needed.
slbt_get_mkvars_var(): optimmize the code path for set but empty variables.
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