OVCCGtk: properly check for sed and use the found version

clients/ovcc-gtk/configure.ac

@@ -16,6 +16,7 @@ AC_SUBST([ovccgtkdatadir])
 
 # Checks for programs.
 AC_PROG_LN_S
+AC_PROG_SED
 AC_PROG_CC
 AM_PROG_VALAC([0.7])
 AC_CHECK_PROGS([GLIB_GENMARSHAL], [glib-genmarshal], [NONE])

clients/ovcc-gtk/src/Makefile.am

@@ -59,9 +59,9 @@ ovccgtk-marshal.c: $(srcdir)/ovccgtk-marshal.list ovccgtk-marshal.h
 # to prefix=o sub-prefix=vcc_gtk
 ovccgtk-enum-types.c: $(srcdir)/ovccgtk-enum-types.c.tpl ovccgtk-enum-types.h $(headers) Makefile
 	$(AM_V_GEN)$(GLIB_MKENUMS) --template $< $(headers:%=$(srcdir)/%) | \
-	sed s%o_vcc_gtk_%ovccgtk_%g | \
-	sed s%O_TYPE_VCC_GTK_%OVCCGTK_TYPE_%g > $@
+	$(SED) s%o_vcc_gtk_%ovccgtk_%g | \
+	$(SED) s%O_TYPE_VCC_GTK_%OVCCGTK_TYPE_%g > $@
 ovccgtk-enum-types.h: $(srcdir)/ovccgtk-enum-types.h.tpl $(headers) Makefile
 	$(AM_V_GEN)$(GLIB_MKENUMS) --template $< $(headers:%=$(srcdir)/%) | \
-	sed s%o_vcc_gtk_%ovccgtk_%g | \
-	sed s%O_TYPE_VCC_GTK_%OVCCGTK_TYPE_%g > $@
+	$(SED) s%o_vcc_gtk_%ovccgtk_%g | \
+	$(SED) s%O_TYPE_VCC_GTK_%OVCCGTK_TYPE_%g > $@