Add needed includes to vpr_signal_handler #3313
Merged
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vpr_signal_handler.cpp used some header files that were indirectly included. This commit directly adds those header files to vpr_signal_handler.
I also removed the unused includes. This file previously had some issues with the pre-release GCC-16 (See #3306) because unistd.h was not directly included. The ifdef for unix is based on similar code in vtr_util.cpp: