nrf: Revert "nrf/Makefile: Enable LTO by default only on newer gcc.".

This reverts commit 62e0fa0.

Reverting as the only linker wrap needed for nrf port was removed
in the parent commit.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

Author: projectgus

ports/nrf/Makefile

@@ -129,14 +129,7 @@ CFLAGS_MCU_m4 = $(CFLAGS_CORTEX_M) -mtune=cortex-m4 -mcpu=cortex-m4 -mfpu=fpv4-s
 
 CFLAGS_MCU_m0 = $(CFLAGS_CORTEX_M) -fshort-enums -mtune=cortex-m0 -mcpu=cortex-m0 -mfloat-abi=soft
 
-# linker wrap does not work with lto on older gcc/binutils: https://sourceware.org/bugzilla/show_bug.cgi?id=24406
-GCC_VERSION = $(shell arm-none-eabi-gcc -dumpversion)
-GCC_MAJOR_VERS = $(word 1,$(subst ., ,$(GCC_VERSION)))
-ifeq ($(shell test $(GCC_MAJOR_VERS) -ge 10; echo $$?),0)
 LTO ?= 1
-else
-LTO ?= 0
-endif
 
 ifeq ($(LTO),1)
 CFLAGS += -flto