package/php: security bump to version 7.3.3

package/php: security bump to version 7.3.3

php-7.3.3 fixes a number of security issues (no CVE known, bugtracker issues
not yet public): https://secure.php.net/ChangeLog-7.php#7.3.3

Drop 0004-OPcache-flock-mechanism-is-obviously-linux-so-force-.patch as the
flock detection has been removed since commit 9222702633 (Avoid dependency
on "struct flock" fields order.)

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>