Fix build breakage on mips64 and x86_64.

It appears that mips64 doesn't define the same flags for handling long
doubles as the other target architectures. For x86_64, it is spuriously
seeing a request for floatditf(), which I have to narrow down. This
patch fixes the breakage for now, but should be cleaned up when more
appropriate fixes are available.

Change-Id: I3aeef46293bd6dd176096e0b92da714f61188068
1 file changed