.travis.yml: solve the issue with libfl.so.2
.travis.yml: solve the issue with libfl.so.2

On Ubuntu Trusty 12.04 LTS (which is used by Travis CI) the file
libfl.so is a linker script that points to a static library. Re-link
this library into a shared library (with the desired name) and make it
available to executables by changing LD_LIBRARY_PATH environment
variable.
DISTORTEC/distortos,jasmin-j/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,jasmin-j/distortos,CezaryGapinski/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,DISTORTEC/distortos