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Pass archname through env to avoid template injection #776

Job	Run time
ruby-bench (--warmup=1 --bench=1)	15m 44s
make (check, --enable-shared --enable-load-relative)	7m 56s
make (check, ubuntu-24.04, capi)	10m 8s
make (test-bundler-parallel, 50)	25m 23s
make (check, i686)	11m 40s
make (check, cppflags=-DVM_CHECK_MODE)	9m 51s
make (check, --disable-yjit)	8m 25s
make (test-bundled-gems)	21m 42s
make-ibm	-1s
Ubuntu result	2s
	1h 50m 50s