cairo: Avoid deprecated pango_cairo_font_map_create_context().

[John Darrington]

On Sun, Sep 30, 2012 at 11:06:37AM -0700, Ben Pfaff wrote:
     
     Please look over the commits and let me know if any of them seem
     wrong.
     
    Pango 1.30 that is in Debian "wheezy" has marked this function as
    deprecated.  The replacement pango_font_map_create_context() was
    introduced in Pango 1.22, which was also in Debian "squeeze" (which
    had Pango 1.28), so it seems safe to switch without worrying about
    a Pango version check.


But configure.ac checks for Pango 1.20 or later.  So if we're now relying
on 1.22 we need to fix configure.ac too.

J'

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