The new helper functions check_curl_easy_setopt() and
check_curl_multi_setopt() encapsulate the pervasive idiom:

    code = curl_{easy,multi}_setopt(handle, option, arg);
    check_curl_{easy,multi}_code(code, option);

But since each of these helper functions contains its own local CURL{,M}code
variable 'code', having a caller-scope variable reused for every such call is
no longer necessary -- in fact is no longer used at all. That produces a fatal
warning with MSVC. Get rid of those now-unused variables.

Mani captured that snapshot back when CMake version 2.8 was newer than what
was running on our build systems. Now we have to assume that the bundled
GetPrerequisites.cmake is better than our old snapshot. Use the bunded one.

To support that, enhance path_optional() to accept wildcards and return the
expanded filenames.

The nghttp2 autobuild package has copyright information that embeds a newline.
autobuild install --copyrights correctly produces that information onto two
lines. But that means packages-formatter.py must process any lines that do not
match its expected 'packagename: copyright' pattern as the continuation of the
preceding package's copyright information.

Since the processing for autobuild install --versions is so very similar, fold
both into the same outer loop.

Also report all duplicates for any package, instead of stopping at the first.

generalize exception catching for platform specific code

* do not redirect stderr to stdout
* catch errors generated in platform specific code and display them more nicely
* run_command no longer captures output (only used in one place;
  replaced that with direct use of subprocess)

Fix for MAINT-7787: [Alex Ivy] RC Viewers in 5.1.0 range show black background for CONTENT_TYPE_HTML. (The color we pass to CEF has 4 compontents red, blue, green and alpha.  We were only passing 3 and setting the color and not the alpha. At somepoint in CEF's history the default value must have changed. Passing 0xFF for alpha too - i.e. fully opaque - fixes this)

You can't legitimately perform an ordered comparison between a pointer and an
int, even 0. Fix a number of 'if (ptr > 0)' to plain 'if (ptr)'.

Fix LLEditWearableDictionary::WearableEntry constructor to avoid varargs
mechanism. It used to accept three different counts, followed by three
different lists of enums, fetched in each case as 'int' -- dubious in itself.
The constructor body performed three different loops to populate those enums
into three different member vectors.

Instead, make the constructor accept three vectors and initialize the member
vectors from the passed vectors. Now that C++ has inline vector
initialization, change existing constructor calls to pass temporary vectors
initialized with what used to be the varargs enum values.

The viewer's 00-COMPILE-LINK-RUN.txt recommends passing -gdwarf-2 to the Mac
compiler, and so we've been doing ever since before the viewer-build-variables
repo was engaged. Now we discover that when CMake sees -gdwarf-2, it removes
the -g switch entirely. It also removes it when you pass plain -g. Only when
you pass -gdwarf-with-dsym or just -gdwarf does CMake pass plain -g to the
compiler. Change -gdwarf-2, if specified, to -gdwarf so we at least get -g.

MAINT-7813 - 3D rendering broken on Windows in build 508618. 3D rendering starts before 2D login screen is cleared.
FIXED

Update openssl to codeticket version 508328.
Update curl to codeticket version 508652.

FIXED

Fix for MAINT-7531 Second comment with text 'Write a comment...' appears, when user post comment to Profile Feed and MAINT-7651 Cannot post new message in feed because the 'Share something...' Share button never becomes active. The fix was in Dullahan Mac keyboard code - used to send a keyb event and then char code after for down and not for up.  Now sends it for up and not down and works as expected for these 2 test cases as well as some JavaScript keyboard test pages