feat: add HERMIT_RUSTFLAGS for allowing LTO kernels and more

[mkroening]

See hermit-os/hermit-rs#864 for Rust support.

[github-actions]

Benchmark Results

Benchmark	Current: 3488a00	Previous: 1caea89	Performance Ratio
startup_benchmark Build Time	116.25 s	113.59 s	1.02
startup_benchmark File Size	0.87 MB	0.88 MB	1.00
Startup Time - 1 core	1.01 s (±0.02 s)	1.00 s (±0.02 s)	1.00
Startup Time - 2 cores	1.00 s (±0.02 s)	1.00 s (±0.03 s)	1.00
Startup Time - 4 cores	1.00 s (±0.03 s)	1.00 s (±0.03 s)	1.00
multithreaded_benchmark Build Time	113.82 s	112.31 s	1.01
multithreaded_benchmark File Size	0.97 MB	0.97 MB	1.00
Multithreaded Pi Efficiency - 2 Threads	90.24 % (±8.93 %)	91.87 % (±5.48 %)	0.98
Multithreaded Pi Efficiency - 4 Threads	44.90 % (±3.87 %)	45.62 % (±1.52 %)	0.98
Multithreaded Pi Efficiency - 8 Threads	25.54 % (±1.80 %)	26.92 % (±1.71 %)	0.95
micro_benchmarks Build Time	299.54 s	300.90 s	1.00
micro_benchmarks File Size	0.98 MB	0.98 MB	1.00
Scheduling time - 1 thread	177.70 ticks (±39.54 ticks)	188.89 ticks (±35.95 ticks)	0.94
Scheduling time - 2 threads	106.96 ticks (±18.48 ticks)	109.29 ticks (±17.74 ticks)	0.98
Micro - Time for syscall (getpid)	13.32 ticks (±11.17 ticks)	11.44 ticks (±6.11 ticks)	1.16
Memcpy speed - (built_in) block size 4096	58013.36 MByte/s (±42053.36 MByte/s)	58218.35 MByte/s (±41749.13 MByte/s)	1.00
Memcpy speed - (built_in) block size 1048576	13417.96 MByte/s (±11133.25 MByte/s)	13322.31 MByte/s (±11078.57 MByte/s)	1.01
Memcpy speed - (built_in) block size 16777216	9549.06 MByte/s (±7701.91 MByte/s)	9632.94 MByte/s (±7763.00 MByte/s)	0.99
Memset speed - (built_in) block size 4096	58347.65 MByte/s (±42237.36 MByte/s)	58627.12 MByte/s (±42001.83 MByte/s)	1.00
Memset speed - (built_in) block size 1048576	13814.85 MByte/s (±11357.29 MByte/s)	13664.11 MByte/s (±11297.52 MByte/s)	1.01
Memset speed - (built_in) block size 16777216	9698.18 MByte/s (±7768.97 MByte/s)	9828.35 MByte/s (±7867.40 MByte/s)	0.99
Memcpy speed - (rust) block size 4096	54026.39 MByte/s (±39187.70 MByte/s)	51942.01 MByte/s (±38359.80 MByte/s)	1.04
Memcpy speed - (rust) block size 1048576	13940.59 MByte/s (±12335.87 MByte/s)	12839.06 MByte/s (±10483.71 MByte/s)	1.09
Memcpy speed - (rust) block size 16777216	9622.12 MByte/s (±7763.13 MByte/s)	9531.71 MByte/s (±7678.70 MByte/s)	1.01
Memset speed - (rust) block size 4096	54695.52 MByte/s (±39523.74 MByte/s)	53011.14 MByte/s (±39115.85 MByte/s)	1.03
Memset speed - (rust) block size 1048576	14083.76 MByte/s (±12377.28 MByte/s)	13244.14 MByte/s (±10750.32 MByte/s)	1.06
Memset speed - (rust) block size 16777216	9816.08 MByte/s (±7863.53 MByte/s)	9722.67 MByte/s (±7778.13 MByte/s)	1.01
alloc_benchmarks Build Time	295.49 s	302.31 s	0.98
alloc_benchmarks File Size	0.95 MB	0.95 MB	1.00
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	27055.02 Ticks (±1669.08 Ticks)	26215.84 Ticks (±1230.11 Ticks)	1.03
Allocations - Average Allocation time (no fail)	27055.02 Ticks (±1669.08 Ticks)	26215.84 Ticks (±1230.11 Ticks)	1.03
Allocations - Average Deallocation time	3226.81 Ticks (±1440.86 Ticks)	3319.78 Ticks (±1756.11 Ticks)	0.97
mutex_benchmark Build Time	296.54 s	301.33 s	0.98
mutex_benchmark File Size	0.98 MB	0.98 MB	1.00
Mutex Stress Test Average Time per Iteration - 1 Threads	38.10 ns (±4.75 ns)	38.48 ns (±4.89 ns)	0.99
Mutex Stress Test Average Time per Iteration - 2 Threads	31.08 ns (±3.77 ns)	31.68 ns (±3.36 ns)	0.98

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