scripts: fix stat command compatibility for Linux in release script #373

Job	Run time
test-cargo-optee-std-aarch64	23m 51s
license	37s
test-cargo-optee-std-arm32	21m 59s
systest	2m 18s
test-cargo-optee-nostd-arm32	14m 28s
test-nostd-build-on-dev-docker	12m 39s
test-cargo-optee-nostd-aarch64	9m 44s
test-std-build-on-dev-docker	24m 2s
test-on-arm64-host / build-utee-teec	3m 6s
test-on-amd64-host / build-utee-teec	3m 12s
test-on-arm64-host / build-and-test-examples-for-64bit-no-std-TAs / build-and-test-examples	13m 19s
test-on-arm64-host / build-and-test-examples-for-32bit-std-TAs / build-and-test-examples	19m 3s
test-on-arm64-host / build-and-test-examples-for-32bit-no-std-TAs / build-and-test-examples	13m 16s
test-on-amd64-host / build-and-test-examples-for-32bit-std-TAs / build-and-test-examples	22m 1s
test-on-amd64-host / build-and-test-examples-for-64bit-no-std-TAs / build-and-test-examples	14m 25s
test-on-arm64-host / build-and-test-examples-for-64bit-std-TAs / build-and-test-examples	19m 35s
test-on-amd64-host / build-and-test-examples-for-32bit-no-std-TAs / build-and-test-examples	13m 51s
test-on-amd64-host / build-and-test-examples-for-64bit-std-TAs / build-and-test-examples	24m 2s
	4h 15m 28s

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