Remove bashism

thisisnic · thisisnic · commit 82c40c07735a · 2025-12-01T14:33:48.000Z
diff --git a/r/src/Makevars.in b/r/src/Makevars.in
@@ -31,4 +31,4 @@ PKG_LIBS=@libs@
 all: $(SHLIB) purify
 
 purify: $(SHLIB)
-	@rm -rf ../{libarrow,windows} || true
+	@rm -rf ../libarrow ../windows || true
