profiles/arch/riscv: mask USE=mono for all packages

Already had three packages requiring this mask.

Signed-off-by: Marek Szuba <marecki@gentoo.org>

profiles/arch/riscv/package.use.mask

@@ -57,7 +57,7 @@ dev-libs/gobject-introspection doctool test
 dev-python/markdown test
 x11-libs/gtk+ cups test colord
 net-libs/libsoup samba gssapi test
-net-libs/libproxy mono spidermonkey webkit kde networkmanager
+net-libs/libproxy spidermonkey webkit kde networkmanager
 
 # Sam James <sam@gentoo.org> (2021-03-11)
 # media-libs/libheif isn't keyworded here
@@ -89,8 +89,6 @@ app-editors/emacs gui
 # Yixun Lan <dlan@gentoo.org> (2020-09-01)
 # Dependencies not keyworded
 dev-libs/jansson doc
-# Dependencies not keyworded, require by dev-perl/Net-LibIDN, #737594
-net-dns/libidn mono
 
 # Jakov Smolic <jakov.smolic@sartura.hr> (2020-08-14)
 # Large amount of missing keywords

profiles/arch/riscv/use.mask

@@ -32,6 +32,7 @@ kerberos
 latex
 libedit
 lua
+mono
 motif
 opencl
 qt5