Update build system

Closes: https://github.com/named-data/repo-ng/pull/2

Change-Id: If5644f6b894d815e3c75c4404d2076fa559d7737
diff --git a/.jenkins b/.jenkins
index afc4699..674d751 100755
--- a/.jenkins
+++ b/.jenkins
@@ -3,7 +3,8 @@
 
 DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 
-for i in $( find "$DIR/.jenkins.d" -type f -perm +111 | sort ); do
-    echo "Run: $i"
-    "$i"
+for file in "$DIR"/.jenkins.d/*; do
+    [[ -f $file && -x $file ]] || continue
+    echo "Run: $file"
+    "$file"
 done