Makefile: add alternative links for gsoap arhive fixed #7

sourceforge.net changes URL after the new releases!
I have added alternative links. It should be resolved issue #7

Makefile

@@ -218,7 +218,9 @@ define build_gsoap
     # get archive
     if [ ! -f SDK/gsoap.zip ]; then \
         mkdir -p SDK; \
-        wget -O ./SDK/gsoap.zip.tmp "https://sourceforge.net/projects/gsoap2/files/gsoap-2.8/gsoap_$(GSOAP_VERSION).zip/download" && \
+        wget -O ./SDK/gsoap.zip.tmp "https://sourceforge.net/projects/gsoap2/files/gsoap-2.8/gsoap_$(GSOAP_VERSION).zip/download"   || \
+        wget -O ./SDK/gsoap.zip.tmp "https://sourceforge.net/projects/gsoap2/files/oldreleases/gsoap_$(GSOAP_VERSION).zip/download" || \
+        wget -O ./SDK/gsoap.zip.tmp "https://master.dl.sourceforge.net/project/gsoap2/oldreleases/gsoap_$(GSOAP_VERSION).zip"       && \
         mv ./SDK/gsoap.zip.tmp ./SDK/gsoap.zip; \
     fi