7.4 Tests (GD)

[niden]

Check if the GD extension is loaded for the Image/GD tests

https://travis-ci.org/phalcon/cphalcon/jobs/579952736#L1562

[ruudboon]

Founded some info about changed build params. https://github.com/php/php-src/blob/9499484ed2f0377678b2b4d88573327ee0e4ce6d/UPGRADING#L394

[sergeyklay]

@ruudboon We're not build PHP form source, Travis team uses this project: https://github.com/php-build/php-build

[ruudboon]

@sergeyklay Hmm they already fixed it there

[ruudboon]

For bionic the correct config is missing in Travis. I've created a pull that should solve this. travis-ci/php-src-builder#43

[sergeyklay]

Fixed in the 4.0.x branch.