os-release: populate sysroot

Put os-release in the sysroot so it can be accessed by other
recipes.

Change-Id: Id97d44bcec0272d6b7dc29831a056e419579adc9
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-core/os-release/os-release.bbappend b/common/recipes-core/os-release/os-release.bbappend
index c81eae6..77249fc 100644
--- a/common/recipes-core/os-release/os-release.bbappend
+++ b/common/recipes-core/os-release/os-release.bbappend
@@ -30,3 +30,6 @@
 
 # Ensure the git commands run every time bitbake is invoked.
 BB_DONT_CACHE = "1"
+
+# Make os-release available to other recipes.
+SYSROOT_DIRS_append = " ${sysconfdir}"