php: bump to 7.2.1

Also update 0003-configure-disable-the-phar-tool.patch as configure.in is no
longer provided in the tarballs. Instead, configure.ac is patched.

Signed-off-by: Adam Duskett <Adamduskett@outlook.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>