Add script for determining the set of symbols to export from a library. * build-aux/declared.sh: New file, from GNU libunistring. * doc/lib-symbol-visibility.texi (Exported Symbols of Shared Libraries): Mention it.

Files:
tests/test-unlink.h
tests/test-unlink.c
tests/signature.h
tests/macros.h

Depends-on:
ignore-value
stdbool
symlink
unlinkdir

configure.ac:

Makefile.am:
TESTS += test-unlink
check_PROGRAMS += test-unlink