fix(steps-guix/binutils): compile from top-level Makefile in pass1

Drop the manual make -C opcodes i386-gen call from pass1.sh and rely on default_src_compile instead.

This avoids failures when opcodes/ is not yet available in the current build context (make: *** opcodes: No such file or directory) and matches the stable top-level recursive build flow used elsewhere in the project.

steps-guix/binutils-2.41/pass1.sh

@@ -157,7 +157,6 @@ src_configure() {
 }
 
 src_compile() {
-    make -C opcodes i386-gen
     default_src_compile
 }