[Gegl-developer] Patch: GIO dependency made optionnal

[Hubert Figuiere]

Hi

Here is my initial patch for GEGL to make gio an optional dependency for
those who run an already obsolete version of glib.

The only non-trivial part is GFileMonitor, and I actually scraped that
part.

Also another caveat is that I had to change the prototype of two
functions that wanted a GInputStream *. 

Any comment?

Hub

PS: there might also be some indent issues. Will fix them.
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