community/waked: fix qualcomm's rtc errata

The RTC on Qualcomm platforms are apparently read-only and don't reflect the current time, this commit adds a patch where we use relative instead of absolute time when writing an alarm to the RTC, as this will work on sdm845 and similiar. Thank you @caleb, who basically told me the problem and suggested to just use relative times in waked.

@craftyguy: The upstream seems kinda dead, your MR adding CMake is still unmerged. Any suggestions what to do about that? It's a simple daemon, so forking it might be an option.