media-gfx/xsane: fix AbsoluteSymlink

I don't see an easy way (right now) to figure out
how deep the GIMP path will be, so let's do this instead.

Package-Manager: Portage-3.0.8, Repoman-3.0.2
Signed-off-by: Sam James <sam@gentoo.org>

media-gfx/xsane/xsane-0.999-r3.ebuild

@@ -83,7 +83,7 @@ src_install() {
 			die "Can't find GIMP plugin directory."
 		fi
 		dodir "${plugindir#${EPREFIX}}"
-		dosym /usr/bin/xsane "${plugindir#${EPREFIX}}"/xsane
+		dosym "${EPREFIX}/usr/bin/xsane" "${plugindir#${EPREFIX}}"/xsane
 	fi
 
 	newicon "${DISTDIR}/${PN}-256x256.png" "${PN}".png