support override TLS_MODEL for linux platform

[hardfist]

I'm using Tracy Profiler in Node.js binding(which use dlopen)
, which relies on rpmalloc. However, this setup throws an error because rpmalloc uses the init-exec TLS model. The issue goes away if I change the TLS model to local-dynamic, but it seems that rpmalloc doesn’t currently support overriding the TLS model on Linux. I’m wondering if rpmalloc could be extended to support overriding the TLS model on Linux platforms.