tests: Accommodate a shell that is not in /bin/sh. * tests/init.sh (setup_): Set srcdir and builddir. (BOURNE_SHELL): New variable. * modules/acl-tests (Depends-on): Add 'test-framework-sh'. * modules/file-has-acl-tests (Depends-on): Likewise. * modules/copy-file-tests (Depends-on): Likewise. * tests/test-set-mode-acl-1.sh: Use the test framework. Invoke shell scripts through $BOURNE_SHELL. * tests/test-set-mode-acl-2.sh: Likewise. * tests/test-copy-acl-1.sh: Likewise. * tests/test-copy-acl-2.sh: Likewise. * tests/test-file-has-acl-1.sh: Likewise. * tests/test-file-has-acl-2.sh: Likewise. * tests/test-copy-file-1.sh: Likewise. * tests/test-copy-file-2.sh: Likewise. * tests/test-set-mode-acl.sh (builddir): Consider value set by the invoker. * tests/test-copy-acl.sh (builddir): Likewise. * tests/test-file-has-acl.sh (builddir): Likewise. * tests/test-copy-file.sh (builddir): Likewise. * tests/test-vc-list-files-cvs.sh: Don't create shims for executables in build-aux/. Instead, invoke shell scripts through $BOURNE_SHELL. * tests/test-vc-list-files-git.sh: Likewise.

@node Windows sockets
@section Windows sockets

One of the portability problems for native Windows are sockets and
networking functions.

@subsection Getaddrinfo and WINVER

This was written for the @code{getaddrinfo} module, but may be applicable to
other functions too.

The @code{getaddrinfo} function exists in @code{ws2tcpip.h} and @code{-lws2_32}
on Windows XP.  The function declaration is present if @code{WINVER >= 0x0501}.
Windows 2000 does not have @code{getaddrinfo} in its @file{WS2_32.DLL}.

Thus, if you want to assume Windows XP or later, you can add
@code{AC_DEFINE([WINVER], [0x0501])} to avoid compiling the (partial)
@code{getaddrinfo} implementation.

If you want to support Windows 2000, don't do anything.  The
replacement function will open @file{WS2_32.DLL} during run-time to
see if there is a @code{getaddrinfo} function available, and use it when
available.