Move bionic-unit-tests-static to libclang_rt.builtins

Bug: http://b/129728267
Bug: http://b/117167374

This test is now built with XOM (because libm now uses XOM) but it
should also use libclang_rt.builtins since libgcc is not built with XOM.

Test: bionic-unit-tests-static passes (but used to segfault with XOM
exceptions without this change).

Change-Id: I0b1dfe52e48db5f5e9386c7722ecd91e155be56f
diff --git a/tests/Android.bp b/tests/Android.bp
index a1f3cc3..21acc36 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -700,10 +700,6 @@
 
     static_executable: true,
     stl: "libc++_static",
-
-    // libclang_rt.builtins does not work with libm
-    // http://b/117167374
-    no_libcrt: true,
 }
 
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