ia64: remove redundant READELF from arch/ia64/Makefile

READELF is defined by the top Makefile.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

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-1
arch/ia64/Makefile
··· 14 14 KBUILD_DEFCONFIG := generic_defconfig 15 15 16 16 NM := $(CROSS_COMPILE)nm -B 17 - READELF := $(CROSS_COMPILE)readelf 18 17 19 18 CHECKFLAGS += -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__ 20 19