Add gdk_threads_mutex.

Add gdk_threads_mutex.

1999-09-17  Tor Lillqvist  <tml@iki.fi>

* gdk/win32/gdk.def: Add gdk_threads_mutex.

* gtk/makefile.msc: Correct path to libintl.

Thanks to Tomi Ollila and Bernd Herd: Fix some inconsistencies in
use of gint vs. int, and gint vs. gboolean in headers and
definitions. Use GtkType for the *_get_type functions. Note that
these changes preserve binary compatibility.

* gdk/gdk.c
* gdk/win32/gdk.c
* gdk/gdk.h: Fix inconsistencies: gint vs int.

* gtk/gtkmain.c
* gtk/gtkclist.c
* gtk/gtkmenufactory.c
* gtk/gtknotebook.c
* gtk/gtkwidget.c: Fix inconsistencies, also gint
vs. gboolean.

* gtk/gtkcolorsel.[ch]
* gtk/gtkcombo.[ch]
* gtk/gtkdrawingarea.[ch]
* gtk/gtkgamma.[ch]
* gtk/gtkhandlebox.[ch]
* gtk/gtkhpaned.[ch]
* gtk/gtkhruler.[ch]
* gtk/gtkplug.[ch]
* gtk/gtkpreview.[ch]
* gtk/gtkruler.[ch]
* gtk/gtksocket.[ch]
* gtk/gtkstatusbar.[ch]
* gtk/gtktoolbar.[ch]
* gtk/gtkvbbox.[ch]
* gtk/gtkvpaned.[ch]
* gtk/gtkvruler.[ch]: Always use type GtkType for the *_get_type
functions.

* gtk/gtkgamma.h: Fix bug, missing () in call of
gtk_gamma_curve_get_type() in GTK_GAMMA_CURVE_CLASS.