unbreak ld.bfd arches using libc++;

/usr/bin/../lib/libc++abi.so.0.1: undefined reference to `pthread_rwlock_rdlock'                                     
/usr/bin/../lib/libc++.so.2.0: undefined reference to `pthread_mutexattr_destroy'                                    
/usr/bin/../lib/libc++abi.so.0.1: undefined reference to `pthread_rwlock_unlock'                                     
/usr/bin/../lib/libc++.so.2.0: undefined reference to `pthread_detach'                                               
/usr/bin/../lib/libc++abi.so.0.1: undefined reference to `pthread_rwlock_wrlock'                                     
/usr/bin/../lib/libc++.so.2.0: undefined reference to `pthread_mutexattr_settype'                                    
/usr/bin/../lib/libc++.so.2.0: undefined reference to `pthread_mutexattr_init'                                       
/usr/bin/../lib/libc++.so.2.0: undefined reference to `pthread_join'         

Index: gui-wx/configure/Makefile.in
--- gui-wx/configure/Makefile.in.orig
+++ gui-wx/configure/Makefile.in
@@ -314,7 +314,6 @@ top_srcdir = @top_srcdir@
 ACLOCAL_AMFLAGS = -I m4
 AM_CPPFLAGS = -I$(top_srcdir)/../../gollybase/
 AM_CXXFLAGS = -DGOLLYDIR="$(GOLLYDIR)" -Wall -fno-strict-aliasing
-AM_LDFLAGS = -Wl,--as-needed
 @LINUX_TRUE@liblua_a_CPPFLAGS = -DLUA_USE_LINUX
 @MAC_TRUE@liblua_a_CPPFLAGS = -DLUA_USE_MACOSX
 noinst_LIBRARIES = libgolly.a liblua.a
