media-gfx/openvdb: depend on newer imath/openexr

- Needs imath which is installing to normal locations
- Depend on >=openexr-3 explicitly to ease dependency resolution (why not?)

Closes: https://bugs.gentoo.org/833485
Signed-off-by: Sam James <sam@gentoo.org>

media-gfx/openvdb/openvdb-8.2.0-r5.ebuild

@@ -44,8 +44,8 @@ RDEPEND="
 		')
 	)
 	utils? (
-		dev-libs/imath:=
-		media-libs/openexr:=
+		>=dev-libs/imath-3.1.4-r2:=
+		>=media-libs/openexr-3:=
 	)
 	zlib? ( sys-libs/zlib )
 "

media-gfx/openvdb/openvdb-9.0.0-r2.ebuild

@@ -27,10 +27,10 @@ RDEPEND="
 	dev-libs/boost:=
 	dev-libs/jemalloc:=
 	dev-libs/log4cplus:=
-	dev-libs/imath:=
+	>=dev-libs/imath-3.1.4-r2:=
 	media-libs/glfw
 	media-libs/glu
-	media-libs/openexr:=
+	>=media-libs/openexr-3:=
 	sys-libs/zlib:=
 	x11-libs/libXcursor
 	x11-libs/libXi