libubacktrace: temporarily workaround link issue

temporarily work around circular dependency in linking that was
introduced by 01c125c3bd8f949f8e5711e09152859eecd1b004

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

Rules.mak

@@ -117,7 +117,7 @@ export MAJOR_VERSION MINOR_VERSION SUBLEVEL VERSION ABI_VERSION LC_ALL
 
 LIBC := libc
 SHARED_LIBNAME := $(LIBC).so.$(ABI_VERSION)
-UBACKTRACE_DSO := libubacktrace.so.$(ABI_VERSION)
+UBACKTRACE_DSO := libubacktrace.a #so.$(ABI_VERSION)
 ifneq ($(findstring  $(TARGET_ARCH) , hppa64 ia64 mips64 powerpc64 s390x sparc64 x86_64 ),)
 UCLIBC_LDSO_NAME := ld64-uClibc
 ARCH_NATIVE_BIT := 64
@@ -135,6 +135,9 @@ endif
 ifneq ($(HAS_NO_THREADS),y)
 libpthread.depend := $(top_builddir)lib/libpthread.so
 endif
+ifeq ($(UCLIBC_HAS_BACKTRACE),y)
+libubacktrace.depend := $(top_builddir)lib/libubacktrace.a
+endif
 interp := $(top_builddir)lib/interp.os
 ldso := $(top_builddir)lib/$(UCLIBC_LDSO)
 headers_dep := $(top_builddir)include/bits/sysnum.h

libc/Makefile.in

@@ -20,7 +20,7 @@ LDFLAGS-libc.so := $(LDFLAGS) $(VERSION_SCRIPT) -Wl,-init,$(SYMBOL_PREFIX)__uCli
 ifeq ($(UCLIBC_HAS_STDIO_FUTEXES),y)
 CFLAGS += -D__USE_STDIO_FUTEXES__
 endif
-LIBS-libc.so := $(interp) $(ldso) $(top_builddir)lib/$(NONSHARED_LIBNAME)
+LIBS-libc.so := $(interp) $(ldso) $(top_builddir)lib/$(NONSHARED_LIBNAME) $(libubacktrace.depend)
 
 # we have SHARED_LIBNAME=libc.so.$(ABI_VERSION) defined in Rules.mak
 libc_FULL_NAME := libuClibc-$(VERSION).so