Sprinkle <sys/featuretest.h> where _*_SOURCE macros are consulted.

Otherwise, the feature tests might come out wrong. For example,
header files that check for _NETBSD_SOURCE won't get the default w

Sprinkle <sys/featuretest.h> where _*_SOURCE macros are consulted.

Otherwise, the feature tests might come out wrong. For example,
header files that check for _NETBSD_SOURCE won't get the default when
no other _*_SOURCE macros are defined; header files that check for
_POSIX_C_SOURCE might miss _XOPEN_SOURCE, which is supposed to imply
a corresponding _POSIX_C_SOURCE.

PR lib/58752: various header files test _*_SOURCE macros but don't
include sys/featuretest.h

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PR lib/54744 (bruno@haible.de)

Add missing __END_DECLS for C++ compiles.

XXX pullup -9 XXX pullup -8 (bug not present in -7).

Add missing strfmon_l. Noticed by Bruno Haible. Add test case.

add missing attributes to the remaining calls, even the ones that gcc has
builtin attributes for (for symmetry and consistency). In the future this
might change to use compiler-neutral macros. On the

add missing attributes to the remaining calls, even the ones that gcc has
builtin attributes for (for symmetry and consistency). In the future this
might change to use compiler-neutral macros. On the other hand I don't
know of any other compiler that provides other macros with similar
functionality, so why bother?

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Add FreeBSD's strfmon(3). From Rui Paulo. No bump this time. Take advantage
of the getpwent_r bump.