lang/ghc: fix build on aarch64

checking for llc-6.0... no
checking for llc... no
checking for opt-6.0... no
checking for opt... no

checking for llc-9... no
checking for llc-9.0... no
checking for llc... no
checking for opt-9... no
checking for opt-9.0... no
checking for opt... no

PR: 252166
Approved by: portmgr (tier-2 blanket)