Fix wrong negation in Glob::glob() introduced with 3.6.3

[driehle]

Q	A
Documentation	no
Bugfix	yes
BC Break	no
New Feature	no
RFC	no
QA	no

Summary

This PR fixes #45.

Description

Currently, all CI actions all executed using Ubuntu (latest). In Glob.php there is a distinction of cases if the current distribution supports GLOB_BRACE or not. If it does systemGlob() is used, otherwise fallbackGlob() is used.

Now, fallbackGlob() just handles GLOB_BRACE and otherwise relies on systemGlob(). If there is an error like the one introduced in #43, then it can happen that such error is overlooked, because the underlying distribution (Ubuntu) supports GLOB_BRACE. Consequently, CI actions should not only be executed on Ubuntu, but also on a distribution not supporting GLOB_BRACE, like Alpine linux.

This PR adds a CI action running on Alpine Linux. PHPUnit on Alpine Linux brings 4 errors and 1 failure (see output):

There were 4 errors:

1) LaminasTest\Stdlib\StringWrapper\IconvTest::testConvert with data set #1 ('ascii', 'utf-8', 'abc', 'abc')
iconv(): Wrong encoding, conversion from "ASCII" to "UTF-8//IGNORE" is not allowed

/__w/laminas-stdlib/laminas-stdlib/src/StringWrapper/Iconv.php:300
/__w/laminas-stdlib/laminas-stdlib/test/StringWrapper/CommonStringWrapperTest.php:153
/__w/laminas-stdlib/laminas-stdlib/vendor/phpunit/phpunit/phpunit:61

2) LaminasTest\Stdlib\StringWrapper\IconvTest::testConvert with data set #2 ('utf-8', 'ascii', 'abc', 'abc')
iconv(): Wrong encoding, conversion from "UTF-8" to "ASCII//IGNORE" is not allowed

/__w/laminas-stdlib/laminas-stdlib/src/StringWrapper/Iconv.php:300
/__w/laminas-stdlib/laminas-stdlib/test/StringWrapper/CommonStringWrapperTest.php:153
/__w/laminas-stdlib/laminas-stdlib/vendor/phpunit/phpunit/phpunit:61

3) LaminasTest\Stdlib\StringWrapper\IconvTest::testConvert with data set #3 ('utf-8', 'iso-8859-15', '€', '�')
iconv(): Wrong encoding, conversion from "UTF-8" to "ISO-8859-15//IGNORE" is not allowed

/__w/laminas-stdlib/laminas-stdlib/src/StringWrapper/Iconv.php:300
/__w/laminas-stdlib/laminas-stdlib/test/StringWrapper/CommonStringWrapperTest.php:153
/__w/laminas-stdlib/laminas-stdlib/vendor/phpunit/phpunit/phpunit:61

4) LaminasTest\Stdlib\StringWrapper\IconvTest::testConvert with data set #4 ('utf-8', 'iso-8859-16', '€', '�')
iconv(): Wrong encoding, conversion from "UTF-8" to "ISO-8859-16//IGNORE" is not allowed

/__w/laminas-stdlib/laminas-stdlib/src/StringWrapper/Iconv.php:300
/__w/laminas-stdlib/laminas-stdlib/test/StringWrapper/CommonStringWrapperTest.php:153
/__w/laminas-stdlib/laminas-stdlib/vendor/phpunit/phpunit/phpunit:61

--

There was 1 failure:

1) LaminasTest\Stdlib\GlobTest::testPatterns with data set #0 ('{{,*.}alph,{,*.}bet}a', array('alpha', 'eta.alpha', 'zeta.alpha', 'beta', 'eta.beta', 'zeta.beta'))
Failed asserting that actual size 0 matches expected size 6.

/__w/laminas-stdlib/laminas-stdlib/test/GlobTest.php:69
/__w/laminas-stdlib/laminas-stdlib/vendor/phpunit/phpunit/phpunit:61

The four errors about iconv() are because of a well-known issue with ext-iconv on Alpine Linux and not the fault of this package. I have added a check that skips IconvTest on Alpine Linux. See the following links for further information on this issue:

• iconv(): Wrong charset, conversion from UTF-8 to ASCII//TRANSLIT//IGNORE is not allowed nunomaduro/phpinsights#43
• Proper iconv docker-library/php#240 (comment)

The one failure is exactly the issue introduced in #43 with a wrong negation. That is fixed with the last commit of this PR.