[HarfBuzz] [PATCH] Build system fixes

[Grigori Goronzy]

Hi,

for some time I've been using various fixes for the build system in my
personal tree. See the attachments.

Patch 1 adds a proper "Requires" field to the .pc file to make static
linking work correctly.

Patch 2 and 3 fix icu building, especially without glib.

Patch 4 adds toggles for glib, icu and uniscribe support (uniscribe
disabled by default, because apparently it's mostly for testing purposes).

Patch 5 is not specific to the build system. This implements atomic
reference counting and mutexes with GCC's intrinsics, as a fallback if
there's no glib or win32 support for these operations.

Please let me know what you think about these additions and fixes.

Best regards,
Grigori
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