Change Xserver screen through libXrandr. For complex configurations,
all outputs must have corresponding size modes. As a special case, if
the client requests a single screen with an odd size (for example when
adjusting the size of a non-fullscreen vncviewer), find a smaller
suitable mode, and reduce the framebuffer size as well.

Newer CMake complains when you try to get the property of something
that isn't a target so use the specific if operator instead.

It's not supported in newer CMake, so try to deduce the library
filename from the target name.

Newer versions of Freetype requires libpng as well.

This makes sure other build systems trigger properly, e.g. when
building Xvnc.

Useful for debugging memory leaks and access violations. It is
not available on Windows though, and there is some problem compiling
ObjectiveC++ with it turned on.

This is needed in order to get libtool to treat them as normal
libraries and not "convenience libraries". The latter are linked
with --whole-archive, which pulls a lot of unnecessary stuff into
Xvnc and libvnc.so.

Need to explicitly list DSOs.

We're not doing a sufficient job of keeping this updated so list
it as an external requirement instead.

GnuTLS may be compiled without external libtasn1, so we shouldn't try
to link against it unless it's actually present.

Needed to merge upstream changes in before creating pull request.

GnuTLS may be compiled without external libtasn1, so we shouldn't try
to link against it unless it's actually present.

Our link order should now match the built-in library list.

This happens sometimes in order to enforce a strict ordering.

Otherwise you'll just get the initial response back every time
you call it.

We don't use that directory anymore.

Static builds are the special case, so it should be left off
by default.

This is needed to make sure they are always included, and in the
proper order.

crypt32 is a Windows thing, and it is used no matter the crypto
backend.

CMake is very aggressive about minimising the list of libraries,
so we need to be similarily aggressive about quotes to make sure
we get everything we want and in the correct order.

Commit f95272d created some undefined references in GnuTLS.

Try to link as much as possible statically in an effort to produce
binaries that can be run everywhere.

GnuTLS can have different crypto backends, and it is rarely gcrypt
these days. So we should not be including that unconditionally,
and should not be pointing people at it either. Also remove the
section about Win32 binaries as those are out of date and probably
insecure. Lastly remove the section about static builds as it is
a general issue and in no way complete with just the GnuTLS portions.

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