[Buildroot] Fix to Qt5base-build

[Espen Frimann Koren]

Hi.

I have found a solution to why Qt5 does not find either OpenGL ES2 or EGL
during configuration.

In the file package/qt5/qt5base/qt5base-mkspecs-files.patch, two files are
created in output/build/qt5base-5.0.2/mkspecs/devices/linux-buildroot-g++.
In my opinion the following lines must be included in the file (from the
patch):

QMAKE_LIBS_EGL         += -lEGL
QMAKE_LIBS_OPENGL_ES2  += -lEGL -lGAL

QMAKE_CFLAGS           += -DEGL_API_FB=1
QMAKE_CXXFLAGS         += -DEGL_API_FB=1
QMAKE_CFLAGS_DEBUG     += -DEGL_API_FB=1
QMAKE_CXXFLAGS_DEBUG   += -DEGL_API_FB=1

I cannot commit to the buildroot tree, so someone have to do this. There
are other issues in the corresponding file in
output/build/qt5base-5.0.2/mkspecs/devices/linux-imx6-g++/qmake.conf, which
is provided by Qt themselves, that may need to be taken into consideration,
for instance

EGLFS_PLATFORM_HOOKS_SOURCES = $$PWD/qeglfshooks_imx6.cpp

Maybe there should be possible to select Qt device mkspec in the make
menuconfig-system?

Sp1
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