Allow bionic-unit-tests-glibc to be built again.

When we switched to 64 bit host build be default, we no longer build
the glibc unit tests. Fix that, and also set all host targets to build
multilib.

This change also changes the name of bionic-unit-tests-glibc to add
the suffix of 32 or 64 depending on the host type built.

Change-Id: Ife13f9d80f351750ff02825b086d44bb0c2df828
diff --git a/tests/Android.mk b/tests/Android.mk
index 56b1ef1..c2e76b6 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -365,7 +365,7 @@
 #   cd bionic/tests; mm bionic-unit-tests-glibc-run
 # -----------------------------------------------------------------------------
 
-ifeq ($(HOST_OS)-$(HOST_ARCH),linux-x86)
+ifeq ($(HOST_OS)-$(HOST_ARCH),$(filter $(HOST_OS)-$(HOST_ARCH),linux-x86 linux-x86_64))
 
 bionic-unit-tests-glibc_src_files := \
     atexit_test.cpp \