Create build directory if it doesn't exist when building modular input SPL files

Author: Shakeel Mohamed

setup.py

@@ -94,6 +94,9 @@ def run(self):
         splunklib_dir = "splunklib"
         modinput_dir = os.path.join(splunklib_dir, "modularinput")
 
+        if not os.path.exists("build"):
+            os.makedirs("build")
+
         for app in app_names:
             with closing(tarfile.open(os.path.join("build", app + ".spl"), "w")) as spl:
                 spl.add(