Removes a header originally added for SYS_perf_event_open that caused
issues on a different build system, due to redefinitions of many syscall
__NR_ constants. The required SYS_ constants are already available
via sys/syscall.h.
Fixes expected template for a test to account for extra logs in debug mode.
Manually tested the SUDO tests that may be affected by this change: client.drpttracer_SUDO-test and tool.drcacheoff.kernel.simple_SUDO.
Issue: #5505