feat(syscalls): remove condvar module

[mkroening]

The condition variable syscalls are unused since rust-lang/rust@6813c1c (June 2020).

[github-actions]

Benchmark Results

Benchmark	Current: c3629a6	Previous: 72feee1	Performance Ratio
startup_benchmark Build Time	109.75 s	111.53 s	0.98
startup_benchmark File Size	0.90 MB	0.91 MB	1.00
Startup Time - 1 core	0.85 s (±0.02 s)	0.91 s (±0.02 s)	0.93
Startup Time - 2 cores	0.86 s (±0.02 s)	0.92 s (±0.03 s)	0.93
Startup Time - 4 cores	0.87 s (±0.02 s)	0.93 s (±0.02 s)	0.93
multithreaded_benchmark Build Time	106.01 s	113.03 s	0.94
multithreaded_benchmark File Size	1.01 MB	1.01 MB	0.99
Multithreaded Pi Efficiency - 2 Threads	4.04 % (±19.41 %)	3.76 % (±18.05 %)	1.08
Multithreaded Pi Efficiency - 4 Threads	1.87 % (±8.99 %)	1.60 % (±7.68 %)	1.17
Multithreaded Pi Efficiency - 8 Threads	1.11 % (±5.33 %)	1.01 % (±4.83 %)	1.11
micro_benchmarks Build Time	109.74 s	112.62 s	0.97
micro_benchmarks File Size	1.01 MB	1.01 MB	0.99
Scheduling time - 1 thread	2.54 ticks (±12.21 ticks)	2.79 ticks (±13.40 ticks)	0.91
Scheduling time - 2 threads	1.37 ticks (±6.56 ticks)	1.98 ticks (±9.48 ticks)	0.69
Micro - Time for syscall (getpid)	0.13 ticks (±0.60 ticks)	0.15 ticks (±0.73 ticks)	0.82
Memcpy speed - (built_in) block size 4096	1547.03 MByte/s (±7425.74 MByte/s)	1516.99 MByte/s (±7281.55 MByte/s)	1.02
Memcpy speed - (built_in) block size 1048576	750.78 MByte/s (±3603.74 MByte/s)	721.98 MByte/s (±3465.52 MByte/s)	1.04
Memcpy speed - (built_in) block size 16777216	228.11 MByte/s (±1094.92 MByte/s)	221.28 MByte/s (±1062.12 MByte/s)	1.03
Memset speed - (built_in) block size 4096	1904.76 MByte/s (±9142.86 MByte/s)	1621.62 MByte/s (±7783.78 MByte/s)	1.17
Memset speed - (built_in) block size 1048576	982.92 MByte/s (±4718.02 MByte/s)	990.56 MByte/s (±4754.71 MByte/s)	0.99
Memset speed - (built_in) block size 16777216	976.37 MByte/s (±4686.56 MByte/s)	967.95 MByte/s (±4646.14 MByte/s)	1.01
Memcpy speed - (rust) block size 4096	1043.48 MByte/s (±5008.70 MByte/s)	1212.12 MByte/s (±5818.18 MByte/s)	0.86
Memcpy speed - (rust) block size 1048576	772.29 MByte/s (±3706.99 MByte/s)	756.76 MByte/s (±3632.44 MByte/s)	1.02
Memcpy speed - (rust) block size 16777216	226.06 MByte/s (±1085.07 MByte/s)	223.83 MByte/s (±1074.36 MByte/s)	1.01
Memset speed - (rust) block size 4096	1846.15 MByte/s (±8861.54 MByte/s)	1818.18 MByte/s (±8727.27 MByte/s)	1.02
Memset speed - (rust) block size 1048576	979.86 MByte/s (±4703.35 MByte/s)	995.62 MByte/s (±4778.97 MByte/s)	0.98
Memset speed - (rust) block size 16777216	982.07 MByte/s (±4713.94 MByte/s)	950.07 MByte/s (±4560.34 MByte/s)	1.03
alloc_benchmarks Build Time	103.74 s	105.50 s	0.98
alloc_benchmarks File Size	0.97 MB	0.97 MB	1.00
Allocations - Allocation success	2.00 % (±13.86 %)	2.00 % (±13.86 %)	1
Allocations - Deallocation success	1.41 % (±9.74 %)	1.39 % (±9.65 %)	1.01
Allocations - Pre-fail Allocations	2.00 % (±13.86 %)	2.00 % (±13.86 %)	1
Allocations - Average Allocation time	223.94 Ticks (±1551.84 Ticks)	228.34 Ticks (±1582.32 Ticks)	0.98
Allocations - Average Allocation time (no fail)	223.94 Ticks (±1551.84 Ticks)	228.34 Ticks (±1582.32 Ticks)	0.98
Allocations - Average Deallocation time	14.97 Ticks (±103.74 Ticks)	17.31 Ticks (±119.99 Ticks)	0.86
mutex_benchmark Build Time	103.73 s	102.87 s	1.01
mutex_benchmark File Size	1.01 MB	1.02 MB	0.99
Mutex Stress Test Average Time per Iteration - 1 Threads	0.26 ns (±1.80 ns)	0.24 ns (±1.66 ns)	1.08
Mutex Stress Test Average Time per Iteration - 2 Threads	0.28 ns (±1.94 ns)	0.28 ns (±1.94 ns)	1

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