build: avoid putting local absolute symbols in symbol tables

They're not really useful past the building stage and only needlessly
increase binary file sizes.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -50,6 +50,7 @@ ALL_OBJS-$(CONFIG_X86)   += $(BASEDIR)/c
 CFLAGS += -nostdinc -fno-builtin -fno-common
 CFLAGS += -Werror -Wredundant-decls -Wno-pointer-arith
 CFLAGS += -pipe -g -D__XEN__ -include $(BASEDIR)/include/xen/config.h
+CFLAGS += -Wa,--strip-local-absolute
 CFLAGS += '-D__OBJECT_FILE__="$@"'
 
 CFLAGS-$(verbose)       += -DVERBOSE