[gnome-desktop/wip/smcv/riscv64-seccomp] Use libseccomp on linux-riscv64 now that's available

[Simon McVittie <smcv src gnome org>]

commit 2db53f95a151dbc27953e77be3f70ffdd1ab3e7c
Author: Laurent Bigonville <bigon debian org>
Date:   Mon Mar 16 12:31:59 2020 +0100

    Use libseccomp on linux-riscv64 now that's available
    
    This requires libseccomp >= 2.4.3, and reverts commit f8916f70.
    
    [smcv: Added commit message to a patch from the Debian packaging]

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 8d819b70..c8725267 100644
--- a/meson.build
+++ b/meson.build
@@ -57,7 +57,7 @@ udev_dep = dependency('libudev', required: get_option('udev'))
 host_os = host_machine.system()
 host_cpu = host_machine.cpu()
 supported_os = ['linux']
-unsupported_cpus = ['alpha', 'ia64', 'm68k', 'riscv64', 'sh4', 'sparc', 'sparc64']
+unsupported_cpus = ['alpha', 'ia64', 'm68k', 'sh4', 'sparc', 'sparc64']
 if supported_os.contains(host_os) and not unsupported_cpus.contains(host_cpu)
   seccomp_dep = dependency('libseccomp')
 else