Add PATH/LD_LIBRARY_PATH to qrcAlias invocation
Add PATH/LD_LIBRARY_PATH to qrcAlias invocation

Summary: Build fails to generate binary resource (breeze-icons.rcc) by default. The proposed patch fixes this by adding the QtCore directory to the qrcAlias command invocation.

Test Plan:
1. In root of breeze-icons project generate the project using CMake with install prefix set
2. The resultant makefiles or .vcxproj files should have PATH=<path to qt core> (on Windows) and LD_LIBRARY_PATH=<path to qt core> (on Unix)
2. Build the install target
3. Verify that breeze-icons.rcc was successfully copied to <install prefix>/bin/data/icons/breeze
4. Same as 3 but for breeze-icons-dark.rcc

Note: it must be tested when Qt is //not// already in the PATH or LD_LIBRARY_PATH

Reviewers: #vdg, ndavis

Reviewed By: #vdg, ndavis

Subscribers: kde-frameworks-devel, #vdg

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D24477

KDE/breeze-icons,KDE/breeze-icons,KDE/breeze-icons,KDE/breeze-icons,KDE/breeze-icons