Only build Qt 4 input context with Qt 4
Only build Qt 4 input context with Qt 4

To build Maliit itself Qt 5 is required.

RevBy: TrustMe

Full, original commit at 2c02b6375d06073f32c1b3dd28065a87bc2960d7 in maliit-framework

maliit/inputcontext-gtk,maliit/inputcontext-gtk