Investigate cross-build issues with MacOS arm64

[agocke]

As per @am11 in #122085 (comment)

As explained above, with -cross, the build uses cached cmake check and assumes "I can't treat this build machine as target". We can potentially break build for native machine (people using osx-arm64 are not passing -cross for native arch build) while CI will always appear green.

The real error was:

[ 17%] Building CXX object md/datasource/CMakeFiles/mddatasource_dbi.dir/targettypes.cpp.o
/Users/runner/work/1/s/src/coreclr/pal/src/synchmgr/synchmanager.cpp:3573:6: error: "Don't know how to get hi-res current time on this platform"
[ 17%] Building CXX object Corehost.Static/hostmisc/CMakeFiles/hostmisc_public.dir/trace.cpp.o
3573 | #error "Don't know how to get hi-res current time on this platform"
| ^
[ 17%] Building CXX object md/enc/CMakeFiles/mdruntimerw-dbi.dir/peparse.cpp.o
1 error generated.

and it is failing because the cmake detection was failing; something in osx-arm64 machine is not "normal" which we needed to figure out and fix before merging. To do that, we get the cmake log file and investigate.

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[agocke]

I'm going to close this for now -- whenever get access to an arm64 build pool I think we'll move to it immediately, and then this will be resolved.