`RUSTFLAGS='-C target-cpu=native'` causes jvm crash when compile and runtime environments differ

[XorSum]

Describe the bug

The CI machine used for compiling Blaze and the machines in the cluster used for running Blaze are different, resulting in a JVM crash when running.

2024-09-23 11:57:33.692 [Stage 0:(0 + 8) / 8][Stage 1:(0 + 0) / 1][Stage 2:(0 + 0) / 4]
------ initializing blaze native environment ------
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGILL (0x4) at pc=0x00007f2bbad0d7ec, pid=380, tid=0x00007f2bbf533700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_121-b13) (build 1.8.0_121-b13)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.121-b13 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  [libblaze-3882176084054705220.tmp+0x3307ec]  _$LT$blaze..logging..SimpleLogger$u20$as$u20$log..Log$GT$::log::hd1b9037843c55282+0x5c
#
# Core dump written. Default location: 

To Reproduce
Steps to reproduce the behavior:

1. compile and run blaze on different cpu

Expected behavior
do not crash when running

Screenshots
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Additional context
Add any other context about the problem here.

[richox]

i suggest we use target-cpu=native as a default configuration since it can bring extra performance profits with cpu that supports newer simd instructions (like avx512).
however we can add some configurations to allow users to compile with a specified cpu feature.

[XorSum]

i suggest we use target-cpu=native as a default configuration since it can bring extra performance profits with cpu that supports newer simd instructions (like avx512). however we can add some configurations to allow users to compile with a specified cpu feature.

I have modified the pull request to make RUSTFLAGS configurable. If the user does not set the RUSTFLAGS variable, its default value will be -C target-cpu=native; if the user sets the RUSTFLAGS variable, the user's value will be used.