Remove the python symlink install rules.

The python symlink installation will be handled by Buildroot itself, because
Buildroot needs to control to what python interpreter (python2 or python3) the
python symlink points to.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>

Index: b/Makefile.pre.in
===================================================================
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -890,17 +890,10 @@
 #  $(PYTHON) -> python2 -> python$(VERSION))
 # Also create equivalent chains for other installed files
 bininstall:	altbininstall
-	-if test -f $(DESTDIR)$(BINDIR)/$(PYTHON) -o -h $(DESTDIR)$(BINDIR)/$(PYTHON); \
-	then rm -f $(DESTDIR)$(BINDIR)/$(PYTHON); \
-	else true; \
-	fi
-	(cd $(DESTDIR)$(BINDIR); $(LN) -s python2$(EXE) $(PYTHON))
 	-rm -f $(DESTDIR)$(BINDIR)/python2$(EXE)
 	(cd $(DESTDIR)$(BINDIR); $(LN) -s python$(VERSION)$(EXE) python2$(EXE))
 	-rm -f $(DESTDIR)$(BINDIR)/python2-config
 	(cd $(DESTDIR)$(BINDIR); $(LN) -s python$(VERSION)-config python2-config)
-	-rm -f $(DESTDIR)$(BINDIR)/python-config
-	(cd $(DESTDIR)$(BINDIR); $(LN) -s python2-config python-config)
 	-test -d $(DESTDIR)$(LIBPC) || $(INSTALL) -d -m $(DIRMODE) $(DESTDIR)$(LIBPC)
 	-rm -f $(DESTDIR)$(LIBPC)/python2.pc
 	(cd $(DESTDIR)$(LIBPC); $(LN) -s python-$(VERSION).pc python2.pc)