DAOS-16585 tests: Fix NLT handling of __fxstat detection #6776

Job	Run time
Build DAOS (alma.8)	38m 13s
Build DAOS (ARM64) (ubuntu, clang)	1s
Build DAOS (alma.9)	39m 7s
Build DAOS (ARM64) (alma.8, clang)	1s
Create Docker images (ubuntu)	8m 53s
Build DAOS (rocky.8)	39m 7s
Build DAOS (ARM64) (leap.15, clang)	1s
Create Docker images (rocky)	9m 45s
Build DAOS (ubuntu)	36m 4s
Create Docker images (fedora)	10m 24s
Create Docker images (leap.15)	11m 4s
Run DAOS/NLT tests (ubuntu)	24m 30s
Build DAOS in image (ubuntu, clang)	21m 41s
Build DAOS in image (ubuntu, gcc)	22m 41s
Build DAOS in image (rocky, clang)	28m 48s
Build DAOS in image (rocky, gcc)	25m 13s
Build DAOS in image (fedora, clang)	22m 37s
Build DAOS in image (fedora, gcc)	24m 18s
Build DAOS in image (leap.15, clang)	24m 5s
Build DAOS in image (leap.15, gcc)	23m 41s
	6h 50m 14s

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