Work-around Symbian 10.1's broken egl.h

In Symbian 10.1, egl.h itself includes eglext.h. This leads to
EGL_KHR_image & EGL_KHR_image_base being defined, but not the actual
function prototypes for eglCreateImageKHR/eglDestroyImageKHR. But,
because the extension defines were set, Qt assumed (wrongly) that
the EGL library would define eglCreateImageKHR. This left these
functions undefined. The work-around is to check the define
EGL_EGLEXT_PROTOTYPES and still define the function pointers if
it isn't set.

Reviewed-By: TrustMe

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