Makefile: clear all implicit suffix rules
Makefile: clear all implicit suffix rules

Implicit suffix rules can cause some really strange errors when
top-level Rules.mk file generates some files that have "/./" in the
path. This problem can be encountered in subfolder template.
jasmin-j/distortos,jasmin-j/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,DISTORTEC/distortos,CezaryGapinski/distortos,DISTORTEC/distortos,DISTORTEC/distortos,jasmin-j/distortos,CezaryGapinski/distortos,CezaryGapinski/distortos,jasmin-j/distortos,jasmin-j/distortos,CezaryGapinski/distortos