Add dlwrap.c to binutils to simulate dlopen/dlsym for gold plugin

binutils-2.20/bfd/Makefile.in

Index: binutils-2.20/bfd/Makefile.in
===================================================================
--- a/binutils-2.20/bfd/Makefile.in
+++ b/binutils-2.20/bfd/Makefile.in
@@ -336,7 +336,7 @@
 @INSTALL_LIBBFD_FALSE@noinst_LTLIBRARIES = libbfd.la
 AM_CFLAGS = $(WARN_CFLAGS)
 AM_CPPFLAGS = -DBINDIR='"$(bindir)"'
-@PLUGINS_TRUE@LIBDL = -ldl
+@PLUGINS_TRUE@LIBDL = -l:gold-plugin-static.o -lstdc++ -lpthread -ldl
 
 # bfd.h goes here, for now
 BFD_H = bfd.h
@@ -679,6 +679,7 @@
 	pei-sh.lo \
 	peigen.lo \
 	plugin.lo \
+	dlwrap.lo \
 	ppcboot.lo \
 	reloc16.lo \
 	riscix.lo \
@@ -860,6 +861,7 @@
 	pei-ppc.c \
 	pei-sh.c \
 	plugin.c \
+	dlwrap.c \
 	ppcboot.c \
 	reloc16.c \
 	riscix.c \
@@ -1469,6 +1471,7 @@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pepigen.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pex64igen.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/plugin.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/dlwrap.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ppcboot.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/reloc.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/reloc16.Plo@am__quote@