maliit-framework: add dependency on libxcomposite

* otherwise fails in do_compile with:
  | mimremotewindow.cpp:27:39: fatal error: X11/extensions/Xcomposite.h: No such file or directory
  |  #include <X11/extensions/Xcomposite.h>

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
e.bbclass: Fix do_configure_append for B!=S

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>