profiles: update mupdf-related masks in sparc

Following the dropping of the ~sparc keyword.
Signed-off-by: Virgil Dupras <vdupras@gentoo.org>

profiles/arch/sparc/package.use.mask

@@ -1,6 +1,10 @@
 # Copyright 1999-2017 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 
+# Virgil Dupras <vdupras@gentoo.org> (08 Oct 2018)
+# app-text/mupdf sparc keyword was dropped in bug #631970
+net-print/cups-filters pdf
+
 # Sergei Trofimovich <slyfox@gentoo.org> (28 Sep 2018)
 # mpir fails to build at least on sparc: bug #640424
 dev-python/gmpy mpir

profiles/arch/sparc/package.use.stable.mask

@@ -21,10 +21,6 @@
 # media-libs/libraw is not stable
 media-gfx/imagemagick raw
 
-# Virgil Dupras <vdupras@gentoo.org> (18 Aug 2018)
-# app-text/mupdf stable sparc keyword was dropped in bug #658618
-net-print/cups-filters pdf
-
 # Andreas Sturmlechner <asturm@gentoo.org> (7 May 2018)
 # sci-visualization/gnuplot is not stable.
 app-admin/sysstat isag