fix(libsinsp): initialize m_exe_... in threadinfo #5092

Job	Run time
build-libs-linux-amd64-asan 🧐	8m 21s
build-libs-linux-amd64 😁 (system_deps)	5m 2s
build-libs-linux-amd64 😁 (bundled_deps)	16m 31s
build-libs-linux-amd64-static 🎃	22m 4s
build-libs-linux-amd64 😁 (system_deps_w_chisels)	5m 33s
build-libs-linux-amd64 😁 (system_deps_minimal)	3m 41s
build-libs-linux-arm64 😁 (system_deps)	5m 41s
build-libs-others-amd64 😨 (windows-latest)	6m 1s
build-libs-linux-arm64 😁 (bundled_deps)	17m 23s
build-libs-others-amd64 😨 (macos-latest)	12m 33s
build-libs-linux-arm64 😁 (system_deps_w_chisels)	5m 50s
build-libs-linux-arm64 😁 (system_deps_minimal)	4m 5s
build-shared-libs-linux-amd64 🧐	3m 44s
build-shared-libs-macos-amd64 😨	3m 39s
build-libs-emscripten 🧐	3m 57s
run-e2e-tests-amd64 (system_deps)	8m 25s
test-libs-static (bundled_deps)	14m 54s
run-e2e-tests-amd64 (bundled_deps)	19m 59s
run-e2e-tests-amd64 (system_deps_w_chisels)	9m 15s
run-e2e-tests-amd64 (asan)	22m 1s
	3h 18m 39s

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