Remove unneeded code

We always push a pause at the end such that each lookup falls in exactly
one pause_map_t.  Now, only if I can find a better name for that...
Minor
Rename "pause" to "stage"

The compile() function is starting to become illegible...
Minor renaming
Minor
Make both old autoconf and new automake happy

Sigh..

Bug 64039 - undefined macro AM_PROG_AR
Fix icu linking by requesting the library searchpath from icu-config

This is not ideal as we don't like -L/usr/lib in our linker line.
But this is only relevant to environments that don't have pkgconfig
files for ICU...

https://github.com/behdad/harfbuzz/pull/2