gcc-multilib: fix libiberty.a build with -fPIC

srcpkgs/gcc-multilib/patches/fix-libiberty_pic.patch

@@ -0,0 +1,20 @@
+--- libiberty/Makefile.in	2016-08-05 17:07:27.540554328 +0200
++++ libiberty/Makefile.in	2016-08-05 17:18:39.727540789 +0200
+@@ -112,7 +112,7 @@
+ 
+ INCDIR=$(srcdir)/$(MULTISRCTOP)../include
+ 
+-COMPILE.c = $(CC) -c @DEFS@ $(CFLAGS) $(CPPFLAGS) -I. -I$(INCDIR) $(HDEFINES) @ac_libiberty_warn_cflags@
++COMPILE.c = $(CC) -c @DEFS@ $(CFLAGS) $(CPPFLAGS) -fPIC -I. -I$(INCDIR) $(HDEFINES) @ac_libiberty_warn_cflags@
+ 
+ # Just to make sure we don't use a built-in rule with VPATH
+ .c.$(objext):
+@@ -401,7 +401,7 @@
+ demangle: $(ALL) $(srcdir)/cp-demangle.c
+ 	@echo "The standalone demangler, now named c++filt, is now"
+ 	@echo "a part of binutils."
+-	$(CC) @DEFS@ $(CFLAGS) $(CPPFLAGS) -I. -I$(INCDIR) $(HDEFINES) \
++	$(CC) @DEFS@ $(CFLAGS) $(CPPFLAGS) -fPIC -I. -I$(INCDIR) $(HDEFINES) \
+ 	  $(srcdir)/cp-demangle.c -DSTANDALONE_DEMANGLER $(TARGETLIB) -o $@
+ 
+ ls: