install null-log-format when building darshan-util

Otherwise, compile errors are generated when building an external
tool that uses the darshan-logutils api/library.

ChangeLog

@@ -4,6 +4,10 @@ Darshan Release Change Log
 
 Darshan-3.0.0
 =============
+* install darshan-null-log-format.h header when installing
+  darshan-util component, otherwise compiler errors are
+  generated when building external tools that use
+  libdarshan-util
 * update docs to give debugging tips for cases where
   Darshan logs are not generated
 * fix shared library regression test script to check for

darshan-util/Makefile.in

@@ -132,6 +132,7 @@ endif
 	install -m 644 $(srcdir)/darshan-pnetcdf-logutils.h $(includedir)
 	install -m 644 $(srcdir)/darshan-bgq-logutils.h $(includedir)
 	install -m 644 $(srcdir)/darshan-null-logutils.h $(includedir)
+	install -m 644 $(srcdir)/../darshan-null-log-format.h $(includedir)
 	install -m 644 $(srcdir)/../darshan-posix-log-format.h $(includedir)
 	install -m 644 $(srcdir)/../darshan-mpiio-log-format.h $(includedir)
 	install -m 644 $(srcdir)/../darshan-hdf5-log-format.h $(includedir)