Fix version for pie installation

[remicollet]

When installed using pie

$ php --ri imagick

imagick

imagick module => enabled
imagick module version => @PACKAGE_VERSION@
...

In package.xml there is

			<file name="php_imagick.h" role="src">
				<tasks:replace from="@PACKAGE_VERSION@" to="version" type="package-info" />
			</file>

But this is only for pecl

Notice: not much a big work on release, as PHP_IMAGICK_EXTNUM already has to be updated manually