[Bug] Export is hanging when enabling flag GPMF_FLAGS_STORE_ALL_TIMESTAMPS

[AdrienMarty]

I have tested the library on a Linux x86 setup and built with given instructions.
It seems that enabling this flag is stucking the program execution.

Here is the function used that is causing the hang.

GPMFWriteStreamStoreStamped(handleB, STR2FOURCC("SnrB"), GPMF_TYPE_FLOAT, sizeof(float), samples, &testValue, GPMF_FLAGS_STORE_ALL_TIMESTAMPS, tick);

It seems related to an internal interlock issue.

[dnewman-gpsw]

Please try the fix now applied to the develop branch, as it is about time that was merge into master.