Replace -soname with -h for Solaris compatibility. Fixes #1034496.

Backported to 2.3.

Makefile.pre.in

@@ -351,7 +351,7 @@ $(LIBRARY): $(LIBRARY_OBJS)
 
 libpython$(VERSION).so: $(LIBRARY_OBJS)
 	if test $(INSTSONAME) != $(LDLIBRARY); then \
-		$(LDSHARED) -Wl,-soname=$(INSTSONAME) -o $(INSTSONAME) $(LIBRARY_OBJS) $(SHLIBS) $(LIBC) $(LIBM); \
+		$(LDSHARED) -Wl,-h$(INSTSONAME) -o $(INSTSONAME) $(LIBRARY_OBJS) $(SHLIBS) $(LIBC) $(LIBM); \
 		$(LN) -f $(INSTSONAME) $@; \
 	else\
 		$(LDSHARED) -o $@ $(LIBRARY_OBJS) $(SHLIBS) $(LIBC) $(LIBM); \