Add sane-airscan ebuild.

media-gfx/sane-airscan/Manifest

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+DIST airscan-0.99.24.tar.gz 192523 BLAKE2B 8f4d77907ed95e090546fddbcd1a6f4e83f8e7dd4eb95dda36763bbe9755d4bdcdae12ab2701b916b7c8b83607c64bf8853ccd73d186c5d009f6b36b599531c3 SHA512 4dd40b70bdba26d13c06eb2f9abe69c1a74f5252770ad734a0113a63b24149b71ee77f1b88a07e1e1541e6ad402d74ec6832b09204aa38d269796aa1d57148aa
+EBUILD sane-airscan-0.99.24.ebuild 434 BLAKE2B 7613479adde1bf14a780358989d68ba1cce4b437653688e3e5e9ed236d19f6aa746952e4c73ae649569aa0c83830846932cf6dde229896c19e58411ceb87d46e SHA512 5bb247f0981cff8212223ca2f7f738717f271a45cb67ad546a53ae6ca307cbf65358af0aff9dec1a7604c954673fbfd022d286332c1ac67d2e3e95648800b2a8

media-gfx/sane-airscan/sane-airscan-0.99.24.ebuild

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+# Copyright 2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+DESCRIPTION="Sane back-end for AirPrint and Microsoft MDW"
+HOMEPAGE="https://github.com/alexpevzner/sane-airscan"
+SRC_URI="https://github.com/alexpevzner/sane-airscan/archive/0.99.24.tar.gz -> airscan-0.99.24.tar.gz"
+
+LICENSE=""
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+DEPEND="media-gfx/sane-backends"
+RDEPEND="${DEPEND}"
+BDEPEND=""