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d19e885fb9
The `arm_common` syscalls implement `_gettimeofday()` for the benefit of newlib. The syscall call only work if the `rtc` module or the `vtimer` modules is transcluded. If neither module is used, a warning is printed by means of `#warning`. This warning is useless if the user does not invoke `gettimeofday()`. Further this warning prevents the use of `-Werror`. This PR puts the function in its own file, that will only be linked if it was used. And if the function was used, then a link time error occur if neither `rtc` nor `vtimer` was transcluded.