dev-lang/php: revbump dev-lang/php-5.6.15 to fix QA issues.

dev-lang/php: revbump dev-lang/php-5.6.15 to fix QA issues.

This commit fixes a number of issues in the php-5.6.15-r2 ebuild:

  * The ./configure handling is rewritten to use autotools-utils.
    This is the most invasive (and dangerous) change, but fixes
    all of the unquoted $EPREFIX appearing throughout src_configure.

  * Add die() statements to sed, cp, cd, etc. commands.

  * Remove die() statements on helper functions (we're using EAPI 5).

  * Line-wrap some long lines.

Ideally this should behave the same as -r2, but since the change is so
invasive, -r3 is being added masked.

Package-Manager: portage-2.2.20.1