[gparted] Remove unused build definition GPARTED_DATADIR

[Curtis Gedak <gedakc src gnome org>]

commit 7c51b62958a2ffa0ae9276910f7f5238d772f716
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Tue May 2 12:36:46 2017 +0100

    Remove unused build definition GPARTED_DATADIR
    
    Definition has been unused since this commit first released in GParted
    0.5.0:
        c2d19a8ab4eb9e8a9875a7bd7dd0802b9f8303b2
        Replace gnome-open with gtk_show_uri (#600046)

 src/Makefile.am |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index deaa58b..81b99e5 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,7 +2,6 @@ AM_CPPFLAGS =                                           \
        -I$(top_srcdir)/include                         \
        $(GTHREAD_CFLAGS)                               \
        $(GTKMM_CFLAGS)                                 \
-       -DGPARTED_DATADIR=\""$(datadir)"\"                      \
        -DGNOME_ICONDIR=\""$(datadir)/pixmaps"\"                \
        -DGNOMELOCALEDIR=\""$(datadir)/locale"\"