secondlife/viewer#926 further work on mac openexr lib.

switching mac lib to be statically linked

autobuild installables edit openexr platform=darwin64 url=https://github.com/secondlife/3p-openexr/releases/download/v1.10/openexr-3.2.2-darwin64-df7544d.tar.zst hash_algorithm=sha1 hash=17cd63922214b588d9a36137fadf927237ec0f25
autobuild installables edit openexr platform=linux64 url=https://github.com/secondlife/3p-openexr/releases/download/v1.10/openexr-3.2.2-linux64-df7544d.tar.zst hash_algorithm=sha1 hash=b092658ab5ec009a5875e8b6e5b7109730ad6846
autobuild installables edit openexr platform=windows64 url=https://github.com/secondlife/3p-openexr/releases/download/v1.10/openexr-3.2.2-windows64-df7544d.tar.zst hash_algorithm=sha1 hash=c511ae9a3e401375af2199b498a75f32cebc010f