Fixes for upcoming PHP 7.4

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Running Horde_Data test suite with 7.4.0RC3

PHPUnit 5.7.27 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.4.0RC3
Configuration: /dev/shm/BUILD/php-horde-Horde-Data-2.1.4/Horde_Data-2.1.4/test/Horde/Data/phpunit.xml

E............                                                     13 / 13 (100%)

Time: 24 ms, Memory: 4.00MB

There was 1 error:

1) Horde_Data_CsvTest::testImportFile
Function get_magic_quotes_gpc() is deprecated

/usr/share/pear/Horde/Util.php:117
/usr/share/pear/Horde/Variables.php:73
/usr/share/pear/Horde/Variables.php:57
/dev/shm/BUILD/php-horde-Horde-Data-2.1.4/Horde_Data-2.1.4/lib/Horde/Data/Base.php:105
/dev/shm/BUILD/php-horde-Horde-Data-2.1.4/Horde_Data-2.1.4/test/Horde/Data/CsvTest.php:14

ERRORS!
Tests: 13, Assertions: 21, Errors: 1.

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Second commit was found in Horde_Prefs test suite

1) Horde_Prefs_Unit_Storage_FileTest::testConstruction
Invalid characters passed for attempted conversion, these have been ignored
/usr/share/pear/Horde/Util.php:307
/builddir/build/BUILD/php-horde-Horde-Prefs-2.9.0/Horde_Prefs-2.9.0/test/Horde/Prefs/Unit/Storage/FileTest.php:48