Remove gthread leftovers

We don't use gthread anymore, remove leftovers.

configure.ac

@@ -142,12 +142,6 @@ if $have_glib; then
 fi
 AM_CONDITIONAL(HAVE_GLIB, $have_glib)
 
-PKG_CHECK_MODULES(GTHREAD, gthread-2.0, have_gthread=true, have_gthread=false)
-if $have_gthread; then
-	AC_DEFINE(HAVE_GTHREAD, 1, [Have gthread2 library])
-fi
-AM_CONDITIONAL(HAVE_GTHREAD, $have_gthread)
-
 PKG_CHECK_MODULES(GOBJECT, gobject-2.0 glib-2.0 >= 2.16, have_gobject=true, have_gobject=false)
 if $have_gobject; then
 	AC_DEFINE(HAVE_GOBJECT, 1, [Have gobject2 library])

test/api/Makefile.am

@@ -7,8 +7,8 @@ DISTCLEANFILES =
 MAINTAINERCLEANFILES =
 
 if HAVE_GLIB
-AM_CPPFLAGS = -DSRCDIR="\"$(srcdir)\"" -I$(top_srcdir)/src/ -I$(top_builddir)/src/ $(GLIB_CFLAGS) $(GTHREAD_CFLAGS)
-LDADD = $(top_builddir)/src/libharfbuzz.la $(GLIB_LIBS) $(GTHREAD_LIBS)
+AM_CPPFLAGS = -DSRCDIR="\"$(srcdir)\"" -I$(top_srcdir)/src/ -I$(top_builddir)/src/ $(GLIB_CFLAGS)
+LDADD = $(top_builddir)/src/libharfbuzz.la $(GLIB_LIBS)
 
 EXTRA_DIST += hb-test.h
 

test/api/hb-test.h

@@ -76,9 +76,6 @@ srcdir (void)
 static inline void
 hb_test_init (int *argc, char ***argv)
 {
-#if !GLIB_CHECK_VERSION(2,32,0)
-  g_thread_init (NULL);
-#endif
   g_test_init (argc, argv, NULL);
 }