Propagating runtime options with spawn and exec

When going from AMODE 31 to AMODE 64 and back through the spawn or exec functions, Language Environment rebuilds the _CEE_RUNOPTS environment variable as a way to propagate runtime options to the new program. In the situations where AMODE 31 specific options or AMODE 64 specific options would be passed across to the other mode, Language Environment ignores these options. No messages are issued. For example, when the STACK option is sent across from AMODE 31 to AMODE 64, it is ignored. This is because the AMODE 64 application uses the STACK64 option. No attempt to convert the AMODE 31 option to the new AMODE 64 option is performed.