freertos: release the generic version source code

freertos runs on the second core (small one) of the CPU

freertos/Test/CBMC/cmake/compute-property.cmake

@@ -0,0 +1,14 @@
+execute_process(
+    COMMAND
+        cbmc --show-properties --unwinding-assertions --xml-ui
+        ${cbmc_flags} ${cbmc_verbosity} ${goto_binary}
+    OUTPUT_FILE ${out_file}
+    ERROR_FILE ${out_file}
+    RESULT_VARIABLE res
+)
+
+if(NOT (${res} EQUAL 0 OR ${res} EQUAL 10))
+    message(FATAL_ERROR
+        "Unexpected CBMC property return code '${res}' for proof ${proof_name}. Log written to ${out_file}."
+    )
+endif()