plug-ins/sel2path/global.h plug-ins/sel2path/math.c s/acosd/my_acosd/

* plug-ins/sel2path/global.h
* plug-ins/sel2path/math.c
* plug-ins/sel2path/vector.c: s/acosd/my_acosd/ since some platforms
seem to have this function in the native libm

* plug-ins/script-fu/scripts/xach-effect.scm: remove stale debugging
line

* app/guides_cmds.c
* app/tools_cmds.c: changes from below

-Yosh

plug-ins/script-fu/scripts/xach-effect.scm

@@ -46,8 +46,6 @@
 	 (image-height (car (gimp-image-height image)))
 	 (old-bg (car (gimp-palette-get-background))))
 
-    (gimp-message-handler-set 1)
-
     (gimp-image-disable-undo image)
     (gimp-layer-add-alpha drawable)