UnicodePlugin: update README on pkg-config

[dcstes]

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Add a note on

PKG_CHECK_MODULES(UNICODE_PLUGIN,[glib-2.0 pangocairo],,AC_PLUGIN_DISABLE)

which is not being done (not a big problem).

David Stes

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[dcstes]

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Hi,

I think it would be useful to update the README.UnicodePlugin,
but I don't mind closing this PR otherwise ...

Note that the situation is:

• Solaris 10 -> UnicodePlugin builds fine
• Solaris 11.3 -> UnicodePlugin builds OK but is in fact using wrong #include
• Solaris 11.4 -> UnicodePlugin does not compile because cannot #include

Anyway I'm closing the PR but still think would be good for documentation,
that this compile problem is a known issue (and is not a big problem anyway).

David Stes

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