fix for gnutls/Makefile.am in ucommon-3.3.6

[Brian Gough]

Hi, I noticed that gnutls/local.h is missing from the ucommon-3.3.6
release tarball, which causes the build to fail when using gnutls[1].

The patch below fixes the typo (which doesn't trigger any warning from
automake).

Brian Gough

[1] http://chapters.gnu.org/~bjg/gsrc/logs/ucommon.txt

Index: ucommon/gnutls/Makefile.am
===================================================================
--- ucommon/gnutls/Makefile.am  (revision 1451)
+++ ucommon/gnutls/Makefile.am  (working copy)
@@ -12,7 +12,7 @@
 RELEASE = -version-info $(LT_VERSION)
 AM_CXXFLAGS = -I$(top_srcdir)/inc @UCOMMON_FLAGS@
 
-noinst_HEADER = local.h
+noinst_HEADERS = local.h
 
 lib_LTLIBRARIES = libuccsecure.la