wkhtmltopdf: fix argument propagation to wkhtmltopdf binary

component/wkhtmltopdf/buildout.cfg

@@ -35,6 +35,7 @@ script =
   wrapper.write("""#!${dash:location}/bin/dash
   export LD_LIBRARY_PATH=%(location)s:${libXrender:location}/lib/:${fontconfig:location}/lib/:${libX11:location}/lib/:${libXext:location}/lib/
   export PATH=${fontconfig:location}/bin:$PATH
-  exec %(location)s/wkhtmltopdf-""" + WK_SUFIX_MAP[platform]+ """ $*""")
+  exec %(location)s/wkhtmltopdf-""" + WK_SUFIX_MAP[platform]+ """ "$@"
+  """)
   wrapper.close()
   os.chmod(wrapper_location, 0755)