* lib/.gitignore: Use pattern for prominent suffixes like *.o, *.log
and *.a; an entry for the new intermediate file bugreports.o was missing
here. Sort file.
* locate/.gitignore (bigram,code,bigram.o,code.o): Remove, as these
programs have been removed with commit v4.6.0-44-g89ec021.
* find/.gitignore: Use pattern for *.o, and sort the file.
* xargs/.gitignore: Likewise.