Imath 3.1.9 + Openexr 3.1.9.

[motorto]

[ci-skip] [ci skip]

TODO:

• Review. (If someone could do a rebuild of everything changed here would be highly appreciated, I am currently
  leaving my laptop overnight compiling everything with xxbuild for a specific arch, see below what I have already tested, getting some crossbuilding testing would be nice)

Local build testing

• x86_64 (native)

Testing the changes

• I tested the changes in this PR: briefly, as in didn't test some package that were revbumped.

Local build testing

• I built this PR locally for my native architecture, x86_64-glibc

Previously closed the imath 3.1.8 update because of the changed shlib and the high number of packages that would need to be revbumped. Waited for openexr to release a new version and re-opened this.

[motorto]

@Johnnynator could you help with the builds here ?

[Johnnynator]

Build so far for:

• x86_64
• x86_64-musl
• aarch64
• armv7l-musl (in progress)
• riscv64 (in progress)
• riscv64-musl (in progress)

[motorto]

@Johnnynator Wow, thanks for the help !!!!!