[nrf fromtree] cmake: linker: ld: fix duplicate LINK_FLAGS#2878

tejlmand merged 1 commit intonrfconnect:v3.7.99-ncs2-branchnrfconnect/sdk-zephyr:v3.7.99-ncs2-branchfrom

tejlmand:issues/1543_link_flag_duplicationtejlmand/fw-nrfconnect-zephyr-1:issues/1543_link_flag_duplicationCopy head branch name to clipboard