Add support for musl libc

[bharathappali]

Currently OMR is not supported to get compiled on musl libc. As many runtimes are used in cloud mostly with a requirement of less footprint of container images, alpine is major choice in that scenerio as its container image is nearly 5MB. Alpine is built on top of busybox which used musl libc as its default libc so porting OMR to work on musl can get the runtimes built on top of OMR to work on alpine or any other environment where musl libc is used.

FYI - @dinogun @ashu-mehra @charliegracie

[charliegracie]

This could be a good starting point #2511

[bharathappali]

Thanks @charliegracie . Will go through it.

[bharathappali]

As MUSL is not a standard definition from Musl Libc, Can we change it to OMR_MUSL_CLIB as this was suggested in this discussion thread.

@charliegracie can i please have your views on it ?

Thanks in advance.

[0xdaryl]

I am inquiring about the state of this issue and the 8 open PRs that accompany it as there does not appear to be much activity on this front in nearly two years. @bharathappali, what are your plans to move them forward? I think only one (#3823) did not receive any committer attention yet; the rest are either in WIP state or are awaiting input from the author.

If there are no plans to make progress, I suggest the PRs to be closed but this issue to remain open.