Stop definining CRT_LDBL_128BIT.

Bug: http://b/26987366

Compiler-rt now defines this in a separate header file for MIPS64.

Change-Id: Id1bf376117f77d4b2756ce966482e771db4f3a8f
diff --git a/Android.mk b/Android.mk
index 693ac44..2130df2 100644
--- a/Android.mk
+++ b/Android.mk
@@ -378,7 +378,7 @@
 LOCAL_MODULE := libcompiler_rt
 LOCAL_CFLAGS := $(libcompiler_rt_common_CFLAGS)
 LOCAL_CFLAGS_arm += -D__ARM_EABI__
-LOCAL_CFLAGS_mips64 += -DCRT_HAS_128BIT -DCRT_LDBL_128BIT
+LOCAL_CFLAGS_mips64 += -DCRT_HAS_128BIT
 LOCAL_ASFLAGS := -integrated-as
 LOCAL_CLANG := true
 LOCAL_SRC_FILES := lib/builtins/enable_execute_stack.c