Use also file-level dependency for preprocessed linker script
Use also file-level dependency for preprocessed linker script

Without file-level dependency changing project configuration
(distortosConfiguration.mk) properly causes distortosConfiguration.h to
be regenerated, but regenerating preprocessed linker script is not
performed.

See chapter "5. File-level dependencies of custom targets are not
propagated" at
https://samthursfield.wordpress.com/2015/11/21/cmake-dependencies-between-targets-and-files-and-custom-commands/

DISTORTEC/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,DISTORTEC/distortos,jasmin-j/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,jasmin-j/distortos,CezaryGapinski/distortos,jasmin-j/distortos