libunwind: fix previous change for i686-musl

For i686-musl linking against libunwind is still necessary, even if
the build of libunwind itself does not need it.

srcpkgs/libunwind/template

@@ -28,7 +28,7 @@ pre_configure() {
 	# it needs to be here because it's used directly in a macro in a
 	# public header, so things using libunwind need linkage against it
 	case "$XBPS_TARGET_MACHINE" in
-		ppc*-musl)
+		i686-musl|ppc*-musl)
 			vsed -i src/unwind/libunwind.pc.in -e \
 				's/\-lunwind/\-lunwind \-lucontext/'
 		;;