tests/lint: make 'expect+-' comments stricter

Previously, the expectations from these comments were already satisfied
if the expectation occurred somewhere in the actual message from lint.
This mean

tests/lint: make 'expect+-' comments stricter

Previously, the expectations from these comments were already satisfied
if the expectation occurred somewhere in the actual message from lint.
This meant that the prefix 'error:' or 'warning:' could be omitted from
the 'expect' comment. These omissions were hard to see in a manual
review. Now any omissions must be visually marked with '...'.

The test msg_342 now reports its messages properly as being in the file
msg_342.c, rather than msg_341.c. This had been a copy-and-paste
mistake.

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lint: fix parsing of enumerators with __attribute__

lint: fix parsing of __attribute__ before enum tag

The __attribute__ after the enumerators will be fixed in a follow-up
commit since lint exits after the 5th syntax error in a translation
unit, whic

lint: fix parsing of __attribute__ before enum tag

The __attribute__ after the enumerators will be fixed in a follow-up
commit since lint exits after the 5th syntax error in a translation
unit, which up to now shadowed the error messages about the enumerators.

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tests/lint: test __attribute__ with enum

tests/lint: add tests for GCC __attribute__

Before fixing the wrong handling of __attribute__ that is demonstrated
at the end of gcc_attribute.c, ensure that the attribute handling works
in the most

tests/lint: add tests for GCC __attribute__

Before fixing the wrong handling of __attribute__ that is demonstrated
at the end of gcc_attribute.c, ensure that the attribute handling works
in the most basic cases.

Lint currently accepts __attribute__ in more places than it should.
This leads to some ambiguities in the grammar.

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