Moved remaining development PKGBUILDs to package/archlinux.
GCC 4.5 compatibility: no std::string::back() here.
GCC 4.5 compatibility: nullptr-related issues.

Need to explicitly include compatibility header in compiled resource
files.
GCC 4.5 compatibility: more nullptr-related issues.
package: add GCC 4.4 and 4.5 to Jenkins CI configuration.
Utility: properly test array emptiness.

We don't need to compare pointers, just verify whether the array is
nullptr or not.
Merge branch 'master' into compatibility