Get rid of the OPTIMIZE_FOR_CPU variable

This variable, together with the FIXME comment, has been added has
part of Eric Andersen's « Major buildroot facelift, step one » commit
that occured in October 2004.

Since then, no real usage has been made of OPTIMIZE_FOR_CPU, and the
initial intention has probably been lost in the memories of the
implementors.

Therefore, get rid of the variable, and just use $(ARCH) at the two
locations the variable was used.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Makefile.in

@@ -109,8 +109,8 @@ TOOLCHAIN_DIR=$(BASE_DIR)/toolchain
 
 # Quotes are needed for spaces et al in path components.
 TARGET_PATH="$(TOOLCHAIN_DIR)/bin:$(HOST_DIR)/bin:$(HOST_DIR)/usr/bin:$(HOST_DIR)/usr/sbin/:$(STAGING_DIR)/bin:$(STAGING_DIR)/usr/bin:$(PATH)"
-GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)-linux
-REAL_GNU_TARGET_NAME=$(OPTIMIZE_FOR_CPU)$(GNU_TARGET_SUFFIX)
+GNU_TARGET_NAME=$(ARCH)-linux
+REAL_GNU_TARGET_NAME=$(ARCH)$(GNU_TARGET_SUFFIX)
 TARGET_CROSS=$(STAGING_DIR)/usr/bin/$(REAL_GNU_TARGET_NAME)-
 KERNEL_CROSS=$(TARGET_CROSS)
 else ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y)

toolchain/Makefile.in

@@ -30,8 +30,5 @@ BR2_SYSROOT=# nothing
 BR2_ISYSROOT=#nothing
 endif
 
-# FIXME -- this is temporary
-OPTIMIZE_FOR_CPU=$(ARCH)
-
 # gcc has a bunch of needed stuff....
 include toolchain/gcc/Makefile.in