Adds long double comparison functions to the build.

__unordtf2 is needed by libc++. Working for now because a bug in the libc++
build configuration is masking the issue.

Change-Id: Ie7a313a5a627f15deb041b19adeff085d7224e69
diff --git a/Android.mk b/Android.mk
index 0f4ece1..f8bbde7 100644
--- a/Android.mk
+++ b/Android.mk
@@ -45,6 +45,7 @@
   lib/builtins/cmpti2.c \
   lib/builtins/comparedf2.c \
   lib/builtins/comparesf2.c \
+  lib/builtins/comparetf2.c \
   lib/builtins/ctzdi2.c \
   lib/builtins/ctzsi2.c \
   lib/builtins/ctzti2.c \