Error during parallel make
## Summary
The make process fails when parallel compiling is enabled. The error message is this:
mv: cannot stat 'TitanLoggerApi.ttcn_': No such file or directory
make[4]: *** [Makefile:280: TitanLoggerApi.ttcn] Error 1
Please visit this URL for more information: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987646
## Steps and/or TTCN-3 code to reproduce
Build Titan without --no-parallel option and the process will fail sometimes.
## What is the current bug behavior?
It's not consistent, sometimes the build succeeds, sometimes fails with the error above.
## What is the expected correct behavior?
Stable builds without --no-parallel option.
## Relevant logs and/or screenshots
```
mv TitanLoggerApi.ttcn_ TitanLoggerApi.ttcn
mv TitanLoggerApi.ttcn_ TitanLoggerApi.ttcn
mv: cannot stat 'TitanLoggerApi.ttcn_': No such file or directory
make[4]: *** [Makefile:280: TitanLoggerApi.ttcn] Error 1
```
## Possible fixes
N/A
## Titan version
All versions involved.
## Platform details (OS type and version)
Various x86_64 Debian versions. The bug is platform independent.
/cc @aknappqwt
issue