Oops.

Bug 65246 - Fix build without graphite2

Bug 65246 - Fix build without graphite2

If we don't provide ACTION-IF-NOT-FOUND, configure aborts if it can't
find the libraries.  We handle that ourselves so we don't want the
macro to abort.

Currently it only works with ICU that has .pc files.  I'll
wait till someone complains before fixing it for icu-config
systems.

Fallback to older API if OpenType variants are not available.

Defaults to auto.

Defaults to no.

Defaults to no.

We only want UCDN if we don't have any other Unicode provider.
I'm going to remove ICU from the list of default Unicode providers
as part of moving hb-icu into its own library.  As such, the only
providers will be UCDN and glib.

Will add a way to enable it later.

Bug 64878 - compile error with ICU but not ICU

Will add proper way to enable it later.

Add --with-graphite2.  Defaults to off.

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

Sigh..

Bug 64039 - undefined macro AM_PROG_AR

We don't use gthread anymore, remove leftovers.

Ubuntu doesn't (or didn't until recently?) ship icu pkg-config
files.  That's quite unfortunate.  Work around it.

Bug 57608 - ICU Detection fallback for non-pkgconfig systems

Newer automake / libtools warns otherwise.

As reported by Jonathan, OS X has setmode() that is something other
than what setmode() is on Win32.  So, limit invocation to Windows
platforms only.

Looks like Cygwin / MSVC declare it that way, and it still works on
MinGW32 cross.

Based on fontconfig patch from Raimund Steger.