Remove unused GNU_TARGET_SUFFIX

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

Makefile

@@ -236,8 +236,6 @@ BZCAT:=$(call qstrip,$(BR2_BZCAT))
 XZCAT:=$(call qstrip,$(BR2_XZCAT))
 TAR_OPTIONS=$(call qstrip,$(BR2_TAR_OPTIONS)) -xf
 
-GNU_TARGET_SUFFIX:=-$(call qstrip,$(BR2_GNU_TARGET_SUFFIX))
-
 # packages compiled for the host go here
 HOST_DIR:=$(call qstrip,$(BR2_HOST_DIR))