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

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).

The slang internal auto-detection of utf8 is only executed by a call to
SLutf8_enable(-1).