[sugar] [patch] fix gecko-embed pkgconfig

[Robert Staudinger]

Hi,

the attached patch does away with gecko-embed's hardcoded .pc file and
adds an autogen'd one instead. So it becomes usable from a c
application.

The included sample can be built with
gcc `pkg-config --cflags --libs gtk+-2.0 gecko-embed` -lxul -o
gecko-embed-test gecko-embed-test.c
(there seems to be a bug in xulrunner, -lxul is not mentioned in any
of the installed .pc files)

Ok to commit?

- Rob
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