Revert "Switch to llvm-ar (with crsD flags only)."

This reverts commit 13bc31d6e180b7fd52e82d3013c5d6da57fd8c24.

Bug: 71694982
Reason for revert: Broke Mac build

Change-Id: I0da6866442ca9273dd329f0b82932f939b7f65ed
diff --git a/cc/makevars.go b/cc/makevars.go
index 5faf201..0d2569a 100644
--- a/cc/makevars.go
+++ b/cc/makevars.go
@@ -289,7 +289,7 @@
 	if target.Os == android.Darwin {
 		ctx.Strict(makePrefix+"AR", "${config.MacArPath}")
 	} else {
-		ctx.Strict(makePrefix+"AR", "${config.ClangBin}/llvm-ar")
+		ctx.Strict(makePrefix+"AR", gccCmd(toolchain, "ar"))
 		ctx.Strict(makePrefix+"READELF", gccCmd(toolchain, "readelf"))
 		ctx.Strict(makePrefix+"NM", gccCmd(toolchain, "nm"))
 	}