caca_create_display is the same as caca_create_display_with_driver
with a NULL driver, so we can simply call caca_create_display_with_driver.

This breaks loading on Linux, and presumably on other platforms

The Minitest alias was added 14 years ago in minitest 2.12.0, they
got swapped in 2013 in 5.0.0, and the MiniTest alias inow seems to
no longer exist even if I could not find when it went away.

Fixes #86

When the default format is used and export fails, format was NULL

Fixes https://github.com/cacalabs/libcaca/issues/65

Patch from Fedora
https://src.fedoraproject.org/rpms/libcaca/blob/rawhide/f/libcaca-0.99.beta20-c99.patch

This is an internal function that can not be used in this sample code.
Easiest is to duplicate it.

Fixes https://github.com/cacalabs/libcaca/issues/67

Setting bg color via ^C,M does not work on all clients (e.g., irssi).

https://www.mirc.com/colors.html states:

"To specify a background color, a foreground color has to be given. So a
^C,8 attribute is not valid and thus ignored."

https://www.mirc.com/help/html/index.html?change_colors.html suggests:

"You can use color 99 for the default text/background color for a line."

Patch courtesy of Jakub Bogusz.

Patch courtesy of Jakub Bogusz.

Fix py img2txt

Add support for IPv6 to cacaserver

Disable cppunit  tests by default, honor --enable-cppunit

Bold/italic attribute support for export to svg

slang driver: enable utf8 auto-detection (bug fix)

These were all caused by sprintf() appending a null char that was not actually used.
Fixes CVE-2021-30498 and CVE-2021-30499.

Fixes: #52 (CVE-2021-3410)

Fixes: #42

Fixes: #38 (CVE-2018-20546)
Fixes: #39 (CVE-2018-20547)

Fixes: #37 (CVE-2018-20545)
Fixes: #40 (CVE-2018-20548)
Fixes: #41 (CVE-2018-20549)

Fixes: #36 (CVE-2018-20544)

Hide private symbols (issue #33).