[Backport 3.4] Fix C level backtraces for USE_ELF #605

Job	Run time
omnibus compilations, trigger	3s
omnibus compilations, #2	30m 42s
omnibus compilations, #1	29m 12s
omnibus compilations, #3	27m 7s
omnibus compilations, #7	26m 29s
omnibus compilations, #4	25m 47s
omnibus compilations, #6	27m 44s
omnibus compilations, #8	25m 38s
omnibus compilations, #9	26m 42s
omnibus compilations, #10	26m 19s
omnibus compilations, #11	27m 28s
omnibus compilations, #5	27m 26s
omnibus compilations, #12	24m 8s
omnibus compilations, result	3s
	5h 24m 48s

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