Remove cc-option: not used anywhere

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

Makefile

@@ -178,13 +178,6 @@ BUILD_DIR:=$(BASE_DIR)/build
 
 ifeq ($(BR2_HAVE_DOT_CONFIG),y)
 
-# cc-option
-# Usage: cflags-y+=$(call cc-option, -march=winchip-c6, -march=i586)
-# sets -march=winchip-c6 if supported else falls back to -march=i586
-# without checking the latter.
-cc-option=$(shell if $(TARGET_CC) $(TARGET_CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
-	> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
-
 #############################################################
 #
 # Hide troublesome environment variables from sub processes