systemd-boot: Ensure EFI_LD is also passed to compiler driver

Where compiler driver is used for linking ensure bfd linker is used as
well so its consistent when called directly or via compiler

(From OE-Core rev: d497362d52bd934101e7d7a49eeee0fffb0f4f46)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd-boot_254.bb

@@ -11,6 +11,7 @@ inherit deploy
 LDFLAGS:prepend = "${@ " ".join(d.getVar('LD').split()[1:])} "
 
 EFI_LD = "bfd"
+LDFLAGS:append = " -fuse-ld=${EFI_LD}"
 
 do_write_config[vardeps] += "CC OBJCOPY EFI_LD"
 do_write_config:append() {