qt-provider.bbclass: class to allow seamless switching between Qt4 and Qt5
qt-provider.bbclass: class to allow seamless switching between Qt4 and Qt5

Recipes that need to compile against either Qt4 or Qt5 should inherit this class
instead of "inherit qt4e" or "inherit qt5" directly. Setting global QT_PROVIDER
to either "qt4e" or "qt5" will configure those recipes automatically.

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>
Acked-by: Franklin S. Cooper Jr <b8c01a1703dc362919183054a071c1f348818c23@ti.com>
Acked-by: Chase Maupin <874d7d4fa211492c1868f6a91442712d37040f21@ti.com>

rcn-ee/meta-arago,rcn-ee/meta-arago,MentorEmbedded/meta-arago,rcn-ee/meta-arago,MentorEmbedded/meta-arago,MentorEmbedded/meta-arago,rcn-ee/meta-arago,rcn-ee/meta-arago,MentorEmbedded/meta-arago