Add g_close(), use it

There are two benefits to this:

1) We can centralize any operating system specific knowledge of
   close-vs-EINTR handling.  For example, while on Linux we should never
   retry, if someone cared enough later about HP-UX, they could come by
   and change this one spot.
2) For places that do care about the return value and want to provide
   the caller with a GError, this function makes it convenient to do so.

Note that gspawn.c had an incorrect EINTR loop-retry around close().

https://bugzilla.gnome.org/show_bug.cgi?id=682819

docs/reference/glib/glib-sections.txt

@@ -1256,6 +1256,7 @@ g_access
 g_creat
 g_chdir
 g_utime
+g_close
 
 <SUBSECTION Private>
 g_file_error_quark