lint: add more details to 'statement not reached' message

In lib/libcompat/regexp/regexp.c, the FAIL macro expands to a compound
statement containing a function call statement and a return statement

lint: add more details to 'statement not reached' message

In lib/libcompat/regexp/regexp.c, the FAIL macro expands to a compound
statement containing a function call statement and a return statement,
and the macro invocation is followed by a semicolon, forming an extra
empty statement. Which of these statements is unreachable now becomes
clear from the diagnostic, without having to inspect the preprocessed
source code.

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lint: warn about extern declarations outside headers

https://mail-index.netbsd.org/tech-userlevel/2023/03/15/msg013727.html

tests/lint: expect complete messages in feature tests

Previously, the tests contained many comments like /* expect: 123 */,
which were useless to a casual reader since nobody is expected to learn
li

tests/lint: expect complete messages in feature tests

Previously, the tests contained many comments like /* expect: 123 */,
which were useless to a casual reader since nobody is expected to learn
lint's message IDs by heart. Replace these with the complete
diagnostics, to show what lint is complaining about.

The tests named msg_*.c have been left unmodified since they mention the
full message text in their header comment.

No functional change.

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tests/lint: fix typos in comment in expr_range

lint: warn about unreachable case labels for '&&'

See octeon_gmxreg.h 1.2 from 2020-06-18 for an example, where
RXN_RX_INBND_SPEED was cleaned up without adjusting the corresponding
code in octeon_g

lint: warn about unreachable case labels for '&&'

See octeon_gmxreg.h 1.2 from 2020-06-18 for an example, where
RXN_RX_INBND_SPEED was cleaned up without adjusting the corresponding
code in octeon_gmx.c.

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tests/lint: test bitwise mismatch in switch statement