sslh: Bump b72baa0..517e4ad

Mostly bugfixes, but importantly contains a parallel build fix that
periodically affects builds.

Change-Id: Ib60fb1fbd1427f5e6542c12c1383bdc871af5905
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-extended/networking/sslh_git.bb b/meta-google/recipes-extended/networking/sslh_git.bb
index 749ee1d..b683571 100644
--- a/meta-google/recipes-extended/networking/sslh_git.bb
+++ b/meta-google/recipes-extended/networking/sslh_git.bb
@@ -4,7 +4,7 @@
 LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 
 SRC_URI = "git://github.com/yrutschle/sslh"
-SRCREV = "b72baa0622ae2d29152dc251d7c21fe80a3052da"
+SRCREV = "517e4ad5b4d57dae396790882bd4629947be1632"
 S = "${WORKDIR}/git"
 
 inherit perlnative