Allow tests to run when targeting i686 on a host where uname -m returns x86_64.

diff --git a/test/elf/common.inc b/test/elf/common.inc
index 8d5407a827f..8299c1dd7ac 100644
--- a/test/elf/common.inc
+++ b/test/elf/common.inc
@@ -14,7 +14,9 @@ canonical_name() {
   esac
 }
 
-if [ -z "$MACHINE" ]; then
+if [ -n "$XBPS_TARGET_MACHINE" ]; then
+  MACHINE=$(canonical_name "${XBPS_TARGET_MACHINE%-musl}")
+else
   MACHINE=$(canonical_name $(uname -m))
 fi