vips: remove optional flag on jpeg
vips: remove optional flag on jpeg

I've removed the optional flag to jpeg since without jpeg library it fails to build even if configure script figures that the libjpeg is missing and disabled import/export with libjpeg.

Closes #18638.

Signed-off-by: Misty De Meo <85d6b3741948526aebc363d97f74b6575b2cc027@gmail.com>

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