up to 3.4.3

up to 3.4.3

3.4.3
No changes from 3.4.3RC4.

3.4.3RC4
- Fixes:
* Avoid internal segfault.

3.4.3RC3
- Fixes:
* Correct file permissions in built package.

3.4.3RC2
- Fixes:
* Imagick::getRegistry() now throws an exception if the key does not exist, rather than terminating the program.
* Prevent attempts to resize image to zero width or height, which is not supported by ImageMagick.
* Fix compiling on Windows issue.
- Added:
* function Imagick::setImageAlpha() which replaces Imagick::setOpacity()