Remove unused entries from LOCAL_SRC_FILES

The build system does not use headers or directories in LOCAL_SRC_FILES.
To prevent typos, it's becoming a warning to add something to
LOCAL_SRC_FILES that is not used.

Change-Id: I1cf232bce556a92847d700af37f534c7d71deae7
diff --git a/Android.mk b/Android.mk
index f04ce0e..f032a6c 100644
--- a/Android.mk
+++ b/Android.mk
@@ -22,7 +22,6 @@
     src/bind.cpp \
     src/chrono.cpp \
     src/condition_variable.cpp \
-    src/config_elast.h \
     src/debug.cpp \
     src/exception.cpp \
     src/future.cpp \
@@ -40,7 +39,6 @@
     src/stdexcept.cpp \
     src/string.cpp \
     src/strstream.cpp \
-    src/support \
     src/system_error.cpp \
     src/thread.cpp \
     src/typeinfo.cpp \