[Geany] Minor source touchups

[Daniel Richard G.]

See attached patch. A quick review:

* SSM()'s third argument is supposed to be unsigned, so casting to uptr_t 
  seems more correct.

* Various cases of foo() --> foo(void). (Come on guys... the only excuse is 
  if you're older than dirt and still haven't broken your old K&R habits :)

* Make clear that editor_goto_line()'s third argument is an integer, not a 
  double

* Add the gsize cast to the negative second argument of 
  encodings_convert_to_utf8[_from_charset]() where missing, so that the 
  compiler doesn't warn us that it is converting the value to unsigned

* HAVE_GIO should either be #defined to 1, or not #defined at all, per 
  Autoconf convention. My build had broken because I had "#define HAVE_GIO 
  0" in config.h, and "#ifdef HAVE_GIO" in utils.c. ("#ifdef" only looks at 
  whether the symbol is defined or not---the value doesn't matter.)


--Daniel


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