Use single module for libclang_rt.builtins-exported

The clang prebuilts now provide a single module with per-architecture
variants instead of a module per architecture.

Bug: 220019988
Test: m checkbuild
Ignore-AOSP-First: topic contains vendor projects
Change-Id: I079f36f94b13e06d59a16cf665b65db76084021a
Merged-In: I079f36f94b13e06d59a16cf665b65db76084021a
diff --git a/libm/Android.bp b/libm/Android.bp
index 43d82d5..5622e8c 100644
--- a/libm/Android.bp
+++ b/libm/Android.bp
@@ -307,7 +307,7 @@
             no_libcrt: true,
             shared: {
                 // For backwards-compatibility, some arm32 builtins are exported from libm.so.
-                static_libs: ["libclang_rt.builtins-arm-android-exported"],
+                static_libs: ["libclang_rt.builtins-exported"],
             },
         },