build: provide and export ADDR2LINE

Now that x86'es check-endbr.sh script uses it, also make it available
consistently with other tool chain components.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Luca Fancellu <luca.fancellu@arm.com>

config/StdGNU.mk

@@ -10,6 +10,7 @@ CXX        = $(CROSS_COMPILE)g++
 LD_LTO     = $(CROSS_COMPILE)ld
 endif
 CPP        = $(CC) -E
+ADDR2LINE  = $(CROSS_COMPILE)addr2line
 AR         = $(CROSS_COMPILE)ar
 RANLIB     = $(CROSS_COMPILE)ranlib
 NM         = $(CROSS_COMPILE)nm

config/SunOS.mk

@@ -3,6 +3,7 @@ LD         = $(CROSS_COMPILE)gld
 CC         = $(CROSS_COMPILE)gcc
 CPP        = $(CROSS_COMPILE)gcc -E
 CXX        = $(CROSS_COMPILE)g++
+ADDR2LINE  = $(CROSS_COMPILE)gaddr2line
 AR         = $(CROSS_COMPILE)gar
 RANLIB     = $(CROSS_COMPILE)granlib
 NM         = $(CROSS_COMPILE)gnm