The final name of this VS version was announced:

 https://blogs.msdn.microsoft.com/visualstudio/2016/11/16/visual-studio-2017-rc/

Add the year to the generator name accordingly.  For convenience, map
the name without the year to the name with the year.

OpenSSL 1.1 made some CTX structures opaque.  Port our code to use the
structures only through pointers via OpenSSL 1.1 APIs.  Use our adaption
layer to make this work with OpenSSL 1.0 and below.
Patch-by: Tomas Mraz <tmraz@redhat.com>
Patch-from: https://bugzilla.redhat.com/1383744

Add private forwarding headers for `openssl/{evp,hmac}.h` to give us a
central place to add adaptation code to work across multiple
incompatible OpenSSL versions.  Provide compatibility implementations of
some OpenSSL 1.1 APIs when using older OpenSSL versions.

Revert commit v3.7.0-rc1~266^2 (Xcode: Obey SYSTEM keyword for includes,
2015-08-31).  It worked for C, C++, and Swift but not for GNU Assembly
files for which Xcode has no property to set flags.

Closes: #16449

This variable documentation was simply missing.
Suggested-by: Craig Scott <craig.scott@crascit.com>

Expose the binutils' machine name (typically used as a prefix on the
tool names) publicly.  This is expected to match the `gcc -dumpmachine`
value.
Suggested-by: Ruslan Baratov <ruslan_baratov@yahoo.com>

The NDK provides prebuilt toolchain files in directories named for the
host architecture.  The NDK build system calls this `HOST_TAG`.
Expose the value publicly for use by clients that need to pass it
to external tools.
Suggested-by: Ruslan Baratov <ruslan_baratov@yahoo.com>

When this variable is not set by the user or toolchain file, set it to
the default selected.  This will be useful for client code that needs to
pass the value to an external tool that needs to find the same toolchain
in the NDK.  Leave it empty for a standalone toolchain.
Suggested-by: Ruslan Baratov <ruslan_baratov@yahoo.com>

ARMCC does not use the `@` sigil to indicate response files, but instead
the `--via=` flag. See the documentation here:

    http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491h/CHDCIEGC.html

Fixes: #16425

This is what cmake-gui also does to avoid CMake crashing on repeated
attempts to configure it.

Fixes #16423.

The `filename` passed by libuv may be `nullptr`, so handle that
explicitly.

Fixes: #16422

Since commit v3.7.0-rc1~348^2~3 (FindBISON: Change usage of [VERBOSE
<file>] to [VERBOSE [<file>]], 2016-07-16) we always list the VERBOSE
output file as an output of our custom command even if the option is not
used.  This causes the rule to re-run every time (e.g. with Ninja).
Revert one hunk from that change (that looks incorrect) to fix it.

Closes: #16426

Refactoring in commit v3.6.0-rc1~134^2~10 (Autogen: Split out moc file
generation code to dedicated method, 2016-04-18) removed the
unconditional creation of the `<target>_automoc.cpp` file.  Now it is
generated only when `AUTOMOC` is enabled.  However, if this file is not
created then our internal `GenerateAll` setting is enabled on every
build, causing `AUTORCC` to re-generate its file(s) every time.  Fix the
`GenerateAll` setting to be used only for when autogen settings change.
The old logic was left from when we had only automoc.

Closes: #16413

The options to the find_library call to create the imported target
used a literal string "HINTS /path NO_DEFAULT_PATH" instead of a
list of options. This resulted in never finding any library in my
testing.

Also avoid CMP0007 warnings.

Refactoring in commit v3.6.0-rc1~72^2 (HDF5: Rework component searching
to correctly find HL for all bindings, 2016-05-12) changed the default
behavior from finding only the C bindings to finding everything for the
enabled languages.  Restore the original behavior for compatibility and
because many projects need only the C bindings.

Closes: #16397

Running CMake on it caused the following error:

    error: Target "publisher" links to target "Qt5::DBus" but the target
    was not found.  Perhaps a find_package() call is missing for an
    IMPORTED target, or an ALIAS target is missing?

Add the missing DBus component.

`CPACK_RPM_COMPONENT_INSTALL` is the correct variable to set to enable
component packaging.  `CPACK_RPM_PACKAGE_COMPONENT` is just set to a
component name when CPack calls corresponding installer.

`CPACK_DEB_COMPONENT_INSTALL` is the correct variable to set to enable
component packaging.  `CPACK_DEB_PACKAGE_COMPONENT` is just set to a
component name when CPack calls corresponding installer.