PHP fails to build on aarch64

[Ricardo Wurmus]

Hi Guix,

on core-updates-frozen some of the PHP tests keep failing on 
aarch64.  Last time I ran it there were 7 failing tests.  PHP is 
needed for libsoup-minimal, which is an input to gtk 3.

=====================================================================
FAILED TEST SUMMARY
---------------------------------------------------------------------
Concatenating many small strings should not slowdown allocations 
[Zend/tests/concat_003.phpt]
Bug #66731: file: extensive backtraking, with pcre.jit=0 
[ext/fileinfo/tests/cve-2014-3538-nojit.phpt]
Bug #66731: file: extensive backtraking 
[ext/fileinfo/tests/cve-2014-3538.phpt]
Test interoperability of password_hash('argon2i') 
[ext/sodium/tests/php_password_hash_argon2i.phpt]
Test interoperability of password_hash('argon2id') 
[ext/sodium/tests/php_password_hash_argon2id.phpt]
Test interoperability of password_verify() 
[ext/sodium/tests/php_password_verify.phpt]
file upload greater than 2G [sapi/cli/tests/upload_2G.phpt]
=====================================================================

What can we do here?  (It’s a little ugly to need PHP to build 
GTK, but at least it’s just a build time input…)

--
Ricardo