Including individual glib headers no longer supported

[أحمد المحمودي (Ahmed El-Mahmoudy)]

Including invidiual glib headers has been deprecated for several years.

Starting with glib 2.32 it is mandatory to include glib.h instead of individual headers, or the compiler will generate an error.

With the notable exception of:
 glib/gi18n.h
 glib/gi18n-lib.h
 glib/gprintf.h
 glib/gstdio.h
Those header files are still meant to be included separately.

The only affected file in geda (1.6.2) is libgeda/src/s_path.c The attached patch fixes it.

[Juergen Harms (juergen-harms-s)]

A similar patch has been introduced in the geda package of the Mageia distribution (geda-libgeda41-1.7.2-3.mga2) - I have not been able to check the "also affects distribution" checkbox since mageia is not yet "known" to geda