(cherry picked from commit 8976906)

We don't need to install anything in C:\Program Files\BoxBackup, and often
don't have permission to do that anyway.

(cherry picked from commit 2d31a31)
(cherry picked from commit dab8ccc)

Should make debugging on Mac and BSD less painful.

Make t-gdb fail with an error when no debugger was detected.

(cherry picked from commit da98a81)
(cherry picked from commit ea6bc72)
(cherry picked from commit 38ba751)
(cherry picked from commit 02bfd7e)

Previously, it was impossible to include an @ sign in these flags (for example,
to link to support --with-ssl-headers=/usr/local/opt/openssl@1.1/include/)
because it was interpreted as a list variable name by Perl. Now the variables
are evaluated single-quoted before being substituted into the Makefile output.

(cherry picked from commit 2e9c90d)

RAND_pseudo_bytes is less secure and is now deprecated.

(cherry picked from commit f449986)

See #16 for details. Thanks to
Chris West @FauxFaux for the initial patch!

Use OpenSSL 1.1.0g for Windows superbuild.

Fix Windows build by removing calls to obsolete do_ms.bat
<https://stackoverflow.com/questions/39076244/why-there-is-no-ms-do-ms-bat-after-perl-configure-vc-win64a/39247560#39247560>.

Workaround for incorrect library suffixes searched by FindOpenSSL
<https://gitlab.kitware.com/cmake/cmake/issues/17604>.

Link OpenSSL statically and fix missing dependency on crypt32.lib.

(cherry picked from commit edd3687)
(cherry picked from commit b003e00)
(cherry picked from commit cc6e204)
(cherry picked from commit 303c640)
(cherry picked from commit 4e24006)
(cherry picked from commit 448ac48)
(cherry picked from commit 00b3bb0)