WIP: Fix for m68k #1469

Job	Run time
build (libgccjit.so, master, --mini-tests)	9m 25s
duplicates	5s
build (libgccjit.so, master, --std-tests)	9m 45s
build (libgccjit.so, master, --test-libcore)	10m 34s
build (libgccjit.so, master, --extended-rand-tests)	10m 49s
build (libgccjit.so, master, --extended-regex-example-tests)	9m 57s
build (libgccjit.so, master, --extended-regex-tests)	17m 21s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 0)	18m 57s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 1)	25m 27s
build (libgccjit_without_int128.so, master-without-128bit-integers, --mini-tests)	9m 7s
build (libgccjit_without_int128.so, master-without-128bit-integers, --std-tests)	9m 46s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-libcore)	9m 57s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-rand-tests)	10m 21s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-example-tests)	14m 31s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-tests)	21m 10s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	19m 19s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	18m 59s
	3h 45m 30s

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