gtkperf: Remove settings that are default

Remove default setting of AUTORECONF = no

package/gtkperf/gtkperf.mk

@@ -6,7 +6,6 @@
 GTKPERF_VERSION:=0.40
 GTKPERF_SOURCE:=gtkperf_$(GTKPERF_VERSION).tar.gz
 GTKPERF_SITE:=http://$(BR2_SOURCEFORGE_MIRROR).dl.sourceforge.net/sourceforge/gtkperf
-GTKPERF_AUTORECONF = NO
 GTKPERF_INSTALL_TARGET = YES
 GTKPERF_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install
 GTKPERF_DEPENDENCIES = libgtk2