librt: Add missing __dso_handle

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

librt/Makefile.in

@@ -42,6 +42,7 @@ librt_filter_SRC += $(if $(UCLIBC_HAS_ADVANCED_REALTIME),, \
 	spawn_faction_init.c)
 
 librt_filter_SRC += $(if $(UCLIBC_HAS_STUBS),,rt_stubs.c)
+librt_filter_SRC += $(if $(HAS_NO_THREADS),dso_handle.c)
 
 librt_SRC := $(filter-out $(librt_filter_SRC),$(librt_SRC))
 librt_OBJ := $(patsubst %.c,$(librt_OUT)/%.o,$(librt_SRC))

librt/dso_handle.c

@@ -0,0 +1,5 @@
+/* Copyright (C) 2015 Bernhard Reutner-Fischer
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+const void *const __dso_handle attribute_hidden = &__dso_handle;