revert: tests: internal: upstream: use flb_pthread.h"
revert: tests: internal: upstream: use flb_pthread.h"

This reverts commit cd863052283971b1ea2dd8ab4094749923d0aa90.

Signed-off-by: Eduardo Silva <81f705dc2ce1a61a2621e0e4b442a9474e1d0c70@calyptia.com>

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