configure: fix EGL check.
configure: fix EGL check.

This fixes the following error:
checking EGL/egl.h presence... no
configure: WARNING: EGL/egl.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: EGL/egl.h: proceeding with the compiler's result

Signed-off-by: Gwenole Beauchesne <729713629d9640cc095f1c77c692e1881f8093c4@intel.com>

CyanogenMod/android_hardware_intel_libva,halleyzhao/libva-fdo,CyanogenMod/android_hardware_intel_libva,android-ia/hardware_intel_libva,halleyzhao/libva-fdo,CyanogenMod/android_hardware_intel_libva,android-ia/hardware_intel_libva,halleyzhao/libva-fdo,android-ia/hardware_intel_libva