build/x86: suppress GNU ld 2.39 warning about RWX load segments

Commit 68f5aac012 ("build: suppress future GNU ld warning about RWX
load segments") didn't quite cover all the cases: Apparently I missed
ones in the building of 32-bit helper objects because of only looking at
incremental builds (where those wouldn't normally be re-built). Clone
the workaround there to the specific Makefile in question.

Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 3eb1865ae3
master date: 2022-08-11 17:45:12 +0200

xen/arch/x86/boot/build32.mk

@@ -8,6 +8,9 @@ CFLAGS += -Werror -fno-builtin -g0 -msoft-float
 CFLAGS += -I$(BASEDIR)/include
 CFLAGS := $(filter-out -flto,$(CFLAGS)) 
 
+LDFLAGS_DIRECT-$(shell $(LD) -v --warn-rwx-segments >/dev/null 2>&1 && echo y) := --no-warn-rwx-segments
+LDFLAGS_DIRECT += $(LDFLAGS_DIRECT-y)
+
 # NB. awk invocation is a portable alternative to 'head -n -1'
 %.S: %.bin
 	(od -v -t x $< | tr -s ' ' | awk 'NR > 1 {print s} {s=$$0}' | \