abuild: treat syslinux's .c32 files as shared objects

syslinux switched to elf format from 5.0

abuild.in

@@ -1025,7 +1025,7 @@ scan_shared_objects() {
 
 		# we only want shared libs
 		case $soname in
-		*.so|*.so.[0-9]*);;
+		*.so|*.so.[0-9]*|*.c32);;
 		*) continue;;
 		esac