Package libqt5core5 replaced with libqt5core5a

libqt5core5 installs failed.
Package libqt5core5 has replaced with libqt5core5a in ubuntu and debian. 
The website is:
http://packages.ubuntu.com/trusty/libqt5core5a
https://packages.debian.org/sid/libqt5core5a
Merge pull request #5417

be7b0bf Package libqt5core5 replaced with libqt5core5a (LongShao007)