ci: add support for CentOS 7

Refs: #4610
Change-Id: Ibf68c3040663dadfc61f0c9d9e92ff2d486b803a
diff --git a/.jenkins.d/01-ndn-cxx.sh b/.jenkins.d/01-ndn-cxx.sh
index 29a41ea..e627627 100755
--- a/.jenkins.d/01-ndn-cxx.sh
+++ b/.jenkins.d/01-ndn-cxx.sh
@@ -37,8 +37,8 @@
 
 sudo rm -f /usr/local/bin/ndnsec*
 sudo rm -fr /usr/local/include/ndn-cxx
-sudo rm -f /usr/local/lib/libndn-cxx*
-sudo rm -f /usr/local/lib/pkgconfig/libndn-cxx.pc
+sudo rm -f /usr/local/lib{,64}/libndn-cxx*
+sudo rm -f /usr/local/lib{,64}/pkgconfig/libndn-cxx.pc
 
 pushd ndn-cxx >/dev/null