i#3544 RV64: Added machine type support for ELF hdr verification

[ksco]

This patch added ELF header checks for RISC-V.

Issue: #3544

[Reese0710]

I don't know if you ran into this problem when I tried to compile the latest version of the dynamorio like this

then it's failed

I've tried the gcc 7.3.0 & 8.5.0
my OS is centos 8.0 x86, cpu: Intel(R) Xeon(R) Gold 6278 CPU @ 2.60GHz

[ksco]

RISC-V is kinda new, upgrading the compiler to a newer version should fix this. I don't know if we're still supporting old compilers, can you open a new issue so we can discuss it there?

[derekbruening]

Generally if people want support for old or different toolchains that are not part of existing Github Actions continuous testing (Ubuntu 20 and 22 for Linux) we ask that those who want that support do the work of adding and maintaining it as it is not reasonable for the small team of regular contributors to support every toolchain out there.