Remove .ipp from LOCAL_SRC_FILES

The build system does not use .ipp files in LOCAL_SRC_FILES, they are
used by #include'ing them from other source files. To prevent typos,
it's becoming a warning to add something to LOCAL_SRC_FILES that is not
used.

Change-Id: I3b6c64a456777f8e22166e8b9129760b516692bf
diff --git a/Android.mk b/Android.mk
index cb63f11..281bcc8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -32,7 +32,6 @@
     src/cxa_vector.cpp \
     src/cxa_virtual.cpp \
     src/exception.cpp \
-    src/fallback_malloc.ipp \
     src/private_typeinfo.cpp \
     src/stdexcept.cpp \
     src/typeinfo.cpp \