gstlal: resolve ezligolw-related chicken-or-egg situation

- seems an accident of history left me with a header file installed in my
  accounts everywhere that was allowing me to compile this code when nobody
  else could

gstlal/lib/gstlal/Makefile.am

+AM_CPPFLAGS = -I..
+
 EXTRA_DIST =
 CLEANFILES =