rtems6: spike fails to link on arm64-apple-darwin23.2.0

Summary

This was reported by the OAR Build Sweeper. Full output is at this build list entry. The pertinent output is:

g++ -L. -L/lib64  -Wl,-rpath,/Users/tester/rtems-cron-6/tools/6/lib  -o termios-xspike termios-xspike.o  libspike_main.a  libriscv.a  libdisasm.a  libsoftfloat.a  libfesvr.a  libfdt.a -lpthread -lpthread   
ld: warning: directory not found for option '-L/lib64'ld: warning: 
ld: warning: directory not found for option '-L/lib64'
directory not found for option '-L/lib64'
ld: warning: directory not found for option '-L/lib64'
ld: warning: directory not found for option '-L/lib64'
ld: in libspike_main.a(libriscv.a), archive member 'libriscv.a' with length 448440448 is not mach-o or llvm bitcode file 'libspike_main.a' for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ld: in libspike_main.a(libriscv.a), archive member 'libriscv.a' with length 448440448 is not mach-o or llvm bitcode file 'libspike_main.a' for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [xspike] Error 1
make: *** Waiting for unfinished jobs....
make: *** [libcustomext.so] Error 1

This appears to indicate that this version of spike does not have build awareness of arm Macs. Perhaps an update will fix this.

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