const unicode.pLo

4 uses

	unicode (current package)
		graphic.go#L18: 	pLo    = pLl | pLu // a letter that is neither upper nor lower case.
		graphic.go#L19: 	pLmask = pLo
		tables.go#L7422: 	0xAA: pLo | pp, // 'ª'
		tables.go#L7438: 	0xBA: pLo | pp, // 'º'