CONFIG_LD_SCRIPT_DYN is not available for thedefaultarchitecture x86.
Result is shown for architecture um

CONFIG_LD_SCRIPT_DYN (not configurable)

configname: CONFIG_LD_SCRIPT_DYN

Linux Kernel Configuration
└─>UML-specific options
└─>LD_SCRIPT_DYN
In linux kernel since version 2.6.12