Makefile.mk: Remove linker warning on RWX segments

Silence a linker warnings about segments with RWX. Having one segment
for all sections is a good design choice as it makes parsing the elf
into a loadable binary simpler.

Change-Id: I1e0f51c69dabaea314ac45924474d446a9ab68f4
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83559
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>

Makefile.mk

@@ -603,6 +603,9 @@ LDFLAGS_common := --gc-sections
 LDFLAGS_common += -nostdlib
 LDFLAGS_common += --nmagic
 LDFLAGS_common += -static
+# Disable warning on segments with RWX.
+# All loadable sections are placed in the same segment for simplicity.
+LDFLAGS_common += --no-warn-rwx-segments
 
 # Workaround for RISC-V linker bug, merge back into above line when fixed.
 # https://sourceware.org/bugzilla/show_bug.cgi?id=27180