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

Older gcc/binutils linker does not support lto with wrap.Signed-off-by: Andrew Leech <andrew@alelec.net>

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Original file line number	Diff line number	Diff line change
`@@ -129,7 +129,15 @@ CFLAGS_MCU_m4 = $(CFLAGS_CORTEX_M) -mtune=cortex-m4 -mcpu=cortex-m4 -mfpu=fpv4-s`
`129`	`129`
`130`	`130`	`CFLAGS_MCU_m0 =$(CFLAGS_CORTEX_M) -fshort-enums -mtune=cortex-m0 -mcpu=cortex-m0 -mfloat-abi=soft`
`131`	`131`
	`132`	`+# linker wrap does not work with lto on older gcc/binutils: https://sourceware.org/bugzilla/show_bug.cgi?id=24406`
	`133`	`+GCC_VERSION =$(shell arm-none-eabi-gcc --version \| sed -n -E 's:^arm.([0-9]+\.[0-9]+\.[0-9]+).$$:\1:p')`
	`134`	`+GCC_MAJOR_VERS =$(word 1,$(subst ., ,$(GCC_VERSION)))`
	`135`	`+ifeq ($(shell test$(GCC_MAJOR_VERS) -ge 10; echo$$?),0)`
`132`	`136`	`LTO ?= 1`
	`137`	`+else`
	`138`	`+LTO ?= 0`
	`139`	`+endif`
	`140`	`+`
`133`	`141`	`ifeq ($(LTO),1)`
`134`	`142`	`CFLAGS += -flto`
`135`	`143`	`else`

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