Add feature Cold Redundancy

Add an Intel specific feature PSU Cold Redundancy. This is the first patch
which will get PSU information and PSU Event from D-Bus interfaces.
Cold Redundancy design document is in
https://gerrit.openbmc-project.xyz/c/openbmc/docs/+/27637

Signed-off-by: Cheng C Yang <cheng.c.yang@linux.intel.com>
Change-Id: Ic039118e4cebc8b0ff6ba80493180a1d8af0096b
diff --git a/meson.build b/meson.build
index fdccf3c..210ae7f 100644
--- a/meson.build
+++ b/meson.build
@@ -22,6 +22,7 @@
 sdbusplus = dependency('sdbusplus')
 sdbuspp = find_program('sdbus++')
 sdeventplus = dependency('sdeventplus')
+pthread = dependency('threads')
 
 systemd = dependency('systemd')
 servicedir = systemd.get_pkgconfig_variable('systemdsystemunitdir')
@@ -87,3 +88,4 @@
 subdir('power-supply')
 subdir('tools/power-utils')
 subdir('test')
+subdir('cold-redundancy')