konkretreg: ignore KONKRET_REGISTRATION macro in library
konkretreg: ignore KONKRET_REGISTRATION macro in library

On some systems the KONKRET_REGISTRATION macro definition gets
compiled into the provider library and then konkretreg generates
incorrect registration file. This commit adds a check for this
case.

Fixes #6.

rnovacek/konkretcmpi,rnovacek/konkretcmpi,rnovacek/konkretcmpi,kkaempf/konkretcmpi,kkaempf/konkretcmpi,kkaempf/konkretcmpi