prevent multilib reports from failing with trailing ; in configure #324

Job	Run time
build-multilib	0s
test-sim (ubuntu-22.04, newlib, rv64gc-lp64d, spike)	1h 9m 9s
build (ubuntu-20.04, newlib, rv32gc-ilp32d, gcc)	39m 42s
build (ubuntu-20.04, newlib, rv32gc-ilp32d, llvm)	2h 9m 31s
build (ubuntu-20.04, newlib, rv64gc-lp64d, gcc)	43m 52s
build (ubuntu-20.04, newlib, rv64gc-lp64d, llvm)	2h 11m 13s
build (ubuntu-20.04, linux, rv32gc-ilp32d, gcc)	49m 12s
build (ubuntu-20.04, linux, rv32gc-ilp32d, llvm)	2h 22m 7s
build (ubuntu-20.04, linux, rv64gc-lp64d, gcc)	52m 15s
build (ubuntu-20.04, linux, rv64gc-lp64d, llvm)	2h 23m 33s
build (ubuntu-20.04, musl, rv64gc-lp64d, gcc)	42m 55s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, gcc)	1h 37m 3s
build (ubuntu-22.04, newlib, rv32gc-ilp32d, llvm)	2h 3m 19s
build (ubuntu-22.04, newlib, rv64gc-lp64d, gcc)	1h 42m 16s
build (ubuntu-22.04, newlib, rv64gc-lp64d, llvm)	1h 56m 27s
build (ubuntu-22.04, linux, rv32gc-ilp32d, gcc)	2h 22m 26s
build (ubuntu-22.04, linux, rv32gc-ilp32d, llvm)	2h 3m 36s
build (ubuntu-22.04, linux, rv64gc-lp64d, gcc)	2h 22m 52s
build (ubuntu-22.04, linux, rv64gc-lp64d, llvm)	2h 9m 48s
build (ubuntu-22.04, musl, rv64gc-lp64d, gcc)	37m 3s
	1d 6h 58m 19s

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