You have not explicitly asked to use pkg-config and are cross-compiling.
pkg-config will not be used to automatically query cflag/lib parameters for
dependencies
All the OpenGL ES functionality tests failed!
You might need to modify the include and library search paths by editing
QMAKE_INCDIR_OPENGL, QMAKE_LIBDIR_OPENGL and QMAKE_LIBS_OPENGL in
/usr/local/qt-source-cross/qt-everywhere-opensource-src-4.8.4/mkspecs/qws/linux-arm-g++.