mesa-dri 7.8: disable egl for htcdream(this recipe is machine arch)

mesa-dri 7.8: disable egl for htcdream(this recipe is machine arch)

If we don't disable egl,we have some undefined functions at linking:
| xeglgears.o: In function `main':
| xeglgears.c:(.text+0x1afc): undefined reference to `eglCreateImageKHR'
| xeglgears.c:(.text+0x1c4c): undefined reference to `eglCreateImageKHR'
| xeglgears.c:(.text+0x1cf8): undefined reference to `glEGLImageTargetTexture2DOES'
| collect2: ld returned 1 exit status
Note that we don't have 3d(yet and maybe never) on htcdream