media-gfx/povray: several fixes

- add use and upstream to metadata.xml
- EROOT with EAPI=7+ requires explicit slash after
- use EPREFIX rather than EROOR for built-in config paths

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>

media-gfx/povray/metadata.xml

@@ -5,4 +5,10 @@
     <email>team-gentoo@trinitydesktop.org</email>
     <name>Trinity Gentoo ebuilds project</name>
   </maintainer>
+  <use>
+    <flag name="io-restrictions">POV-Ray's mechanism for control of I/O operations</flag>
+  </use>
+  <upstream>
+    <remote-id type="github">POV-Ray/povray</remote-id>
+  </upstream>
 </pkgmetadata>

media-gfx/povray/povray-3.7.0.10-r1.ebuild

@@ -5,7 +5,6 @@ EAPI=8
 
 inherit autotools flag-o-matic virtualx
 
-
 DESCRIPTION="The Persistence of Vision Raytracer"
 HOMEPAGE="https://www.povray.org/"
 SRC_URI="https://github.com/POV-Ray/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
@@ -47,7 +46,7 @@ src_configure() {
 	# but the code compiles using incorrect [default] paths
 	# (based on /usr/local...), so povray will not find the system
 	# config files without the following fix:
-	append-cppflags -DPOVLIBDIR=\\\""${EROOT}"usr/share/${PN}\\\" -DPOVCONFDIR=\\\""${EROOT}"etc/${PN}\\\"
+	append-cppflags -DPOVLIBDIR=\\\""${EPREFIX}"/usr/share/${PN}\\\" -DPOVCONFDIR=\\\""${EPREFIX}"/etc/${PN}\\\"
 
 	# TODO: Restore OpenEXR if upstream start to support OpenEXR 3/imath
 	econf \
@@ -78,11 +77,11 @@ pkg_preinst() {
 	# This way, they can be treated by CONFIG_PROTECT as normal.
 	local conf_file version_dir
 	for conf_file in "${ED}"/etc/"${PN}"/*; do
-		if [ ! -e "${EROOT}etc/${PN}/${conf_file}" ]; then
-			for version_dir in $(echo "${EROOT}"etc/"${PN}"/* | grep "^[0-9]" | sort -rn); do
-				if [ -e "${EROOT}etc/${PN}/${version_dir}/${conf_file}" ]; then
-					mv "${EROOT}etc/${PN}/${version_dir}/${conf_file}" "${EROOT}etc/${PN}" || die
-					elog "Note: ${conf_file} moved from ${EROOT}etc/povray/${version_dir}/ to ${EROOT}etc/povray/"
+		if [ ! -e "${EROOT}/etc/${PN}/${conf_file}" ]; then
+			for version_dir in $(echo "${EROOT}"/etc/"${PN}"/* | grep "^[0-9]" | sort -rn); do
+				if [ -e "${EROOT}/etc/${PN}/${version_dir}/${conf_file}" ]; then
+					mv "${EROOT}/etc/${PN}/${version_dir}/${conf_file}" "${EROOT}/etc/${PN}" || die
+					elog "Note: ${conf_file} moved from ${EROOT}/etc/povray/${version_dir}/ to ${EROOT}/etc/povray/"
 					break
 				fi
 			done