* build-aux/src-sniff.py (checkers): Check for #define directives
which use a macro name which is reserved.
(MakefileRegexChecker): New class which performs regex checks on
makefiles; this ensures that we don't check Makefile.in if we're
going to check Makefile.am anyway.
* lib/unused-result.h: Don't use a reserved identifier in the
macro name defined as the #include guard.
* locate/locatedb.h: Likewise.
* Makefile.am (findutils-check-smells): Don't check gnulib code.
* import-gnulib.sh (hack_gnulib_tool_output): Move the 'do' of a
for loop onto the line following the 'for' (instead of the same
line).
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