package/gcc/gcc-final: remove useless comment and empty variable

We typically don't define empty variables in Buildroot, and the
comment is a bit useless, so drop both.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>

package/gcc/gcc-final/gcc-final.mk

@@ -146,9 +146,6 @@ endif
 
 HOST_GCC_FINAL_LIBS = libgcc_s libatomic
 
-# Handle the installation of libraries in /usr/lib
-HOST_GCC_FINAL_USR_LIBS =
-
 ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
 HOST_GCC_FINAL_USR_LIBS += libstdc++
 endif