Updated swig to 4.0.0

Makefile

 all:
 	$(MAKE) -C ../boost temporary
-	tar xf swig-3.0.12.tar.gz
-	cd swig-3.0.12 && sed -i 's/\$$(PERL5_SCRIPT/-I. &/' Examples/Makefile.in
-	cd swig-3.0.12 && sed -i 's/\$$command 2/-I. &/' Examples/test-suite/perl5/run-perl-test.pl
-	cd swig-3.0.12 && BOOST_ROOT=$(CURDIR)/../boost/boost_1_67_0 ./configure --build=$(CLFS_TARGET) --prefix=/usr --without-clisp --without-maximum-compile-warnings
-	$(MAKE) -C swig-3.0.12
+	tar xf swig-4.0.0.tar.gz
+	cd swig-4.0.0 && sed -i 's/\$$(PERL5_SCRIPT/-I. &/' Examples/Makefile.in
+	cd swig-4.0.0 && sed -i 's/\$$command 2/-I. &/' Examples/test-suite/perl5/run-perl-test.pl
+	cd swig-4.0.0 && BOOST_ROOT=$(CURDIR)/../boost/boost_1_67_0 ./configure --build=$(CLFS_TARGET) --prefix=/usr --without-clisp --without-maximum-compile-warnings
+	$(MAKE) -C swig-4.0.0
 	if [[ ! "$(BUILD_OPTIONS)" =~ no-tests ]] ; then \
-	    $(MAKE) -C swig-3.0.12 check ; \
+	    $(MAKE) -C swig-4.0.0 check ; \
 	fi
-	$(MAKE) -C swig-3.0.12 install
-	install -v -m755 -d /usr/share/doc/swig-3.0.12
-	cd swig-3.0.12 && cp -v -R Doc/* /usr/share/doc/swig-3.0.12
-	rm -rf swig-3.0.12
+	$(MAKE) -C swig-4.0.0 install
+	install -v -m755 -d /usr/share/doc/swig-4.0.0
+	cd swig-4.0.0 && cp -v -R Doc/* /usr/share/doc/swig-4.0.0
+	rm -rf swig-4.0.0
 	$(MAKE) -C ../boost clean