Stop using the local gcc.

Some build servers are still out of date, so we're better off having
the known quanitity of the consistently out-of-date prebuilt host gcc.

Change-Id: Ib6308ae926ffa1ac5d95efbbf32052344c17a6b8
diff --git a/tests/Android.mk b/tests/Android.mk
index da9d676..1e4ef59 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -126,7 +126,6 @@
 # implementation for testing the tests themselves.
 ifeq ($(HOST_OS)-$(HOST_ARCH),linux-x86)
 include $(CLEAR_VARS)
-LOCAL_CXX := /usr/bin/g++ # Avoid the host prebuilt so we test the real glibc.
 LOCAL_MODULE := bionic-unit-tests-glibc
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 LOCAL_CFLAGS += $(test_c_flags)