Quick and dirty PHP7 port.

Author	Piotr Pawłow <pp@siedziba.pl>
Author date	2016-09-08 21:05:41
Author local date	2016-09-08 23:05:41 +0200
Committer	Piotr Pawłow <pp@siedziba.pl>
Committer date	2016-09-08 21:05:41
Committer local date	2016-09-08 23:05:41 +0200
Commit	87380c76cb1eb3644da7291d842281caaae63f2d
Tree	8957300686e074c06f6f5d142093ef0e4c40d2be
Parent	469cf3df58f7d076a62c51c1df2163d23989f924

Quick and dirty PHP7 port.

Using compatibility shims and macros. Compiles both on PHP5 and 7.
Done in one afternoon without much testing, so use at your own risk!

Affected files:
filters/php_bumpmap.c
filters/php_colormatrix.c
filters/php_colormod.c
filters/php_hsbcolor.c
filters/php_testfilter.c
php_imlib.c
php_imlib.h

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