libsysprof-analyze: start on mount namespace APIs

The goal here is that we can try to reproduce to some degree the mount
namespace as the PID saw it, but also convert that to paths where we can
find the files on the host system.

src/libsysprof-analyze/meson.build

@@ -22,6 +22,8 @@ libsysprof_analyze_public_sources = [
 libsysprof_analyze_private_sources = [
   'sysprof-mapped-file.c',
   'sysprof-memory-map.c',
+  'sysprof-mount-device.c',
+  'sysprof-mount-namespace.c',
 ]
 
 libsysprof_analyze_public_headers = [