Update to 7.64

Upstream changes:
Major changes since 7.63:

    Issue #3018637 by emilymoi, das-peter: [regression] Unset the 'host' header in drupal_http_request() during redirect
    Compatibility fixes for PHP 7.3 (#3020771)
    Compatibility fixes for MySQL 5.7 (#2981248)

All changes since 7.63:

    #1430934 by johnish@gmail.com, DamienMcKenna, Berdir, malcomio, Dane Powell, zerolab, er.pushpinderrana, akosipax, njbarrett, Fabianx, alesr, David_Rothstein, littledynamo, das-peter: Notice: Undefined index: display_field in file_field_widget_value() (line 582 of /module/file/file.field.inc)
    #1470656 by Damien Tournoud, joseph.olstad, Pol, Fabianx, catch: Registry rebuild should not parse the same file twice in the same request
    #3028364 by Pol, Fabianx: Update function _registry_update() and move module_implements() and _registry_check_code() calls out of the try/catch
    #3018637 by emilymoi, das-peter: [regression] Unset the 'host' header in drupal_http_request() during redirect
    #3026529 by alexpott: 7.x does not have Phar protection and Phar tests are failing on Drupal 7
    #2482549 by Pol, marcelovani, ndf, drupal@guusvandewal.nl, TR, jenlampton, kaidjohnson, ufku, MiSc, David_Rothstein, RobLoach, pablo.guerino, afoster, geerlingguy, SebCorbin, joelpittet, JohnAlbin: Fix up commit - convert short array styles to long.
    #3023066 by Pol, mfb: [PHP 7.3] Fix BootstrapMiscTestCase::testCheckMemoryLimit() notice
    #2482549 by Pol, marcelovani, ndf, drupal@guusvandewal.nl, jenlampton, ufku, kaidjohnson, MiSc, David_Rothstein, RobLoach, SebCorbin, geerlingguy, pablo.guerino, JohnAlbin, joelpittet, afoster: Ignore node_module folder in core to use Drupal with npm/grunt/nodejs
    #3020771 by Ayesh, Pol, sjerdo: [PHP 7.3] strpos explicit string needle warnings
    #2981248 by mfb, LFP6, msti: MySQL 5.7 incompatibility in system upgrade 7061

(wen)