fix source for PKCS#11 download

configure.ac

@@ -29,11 +29,12 @@ if test "$download_pkcs11" != "no"; then
     AC_MSG_NOTICE([downloading pkcs11 library headers])
     test -d ${prefix}/include || mkdir -p ${prefix}/include
     cd ${prefix}/include
-    for f in $(wget -qO- ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-11/v2-20/ 2>&1 | html2 | sed -n 's,.*/a/@href=\(.*\.h\)$,\1,gp'); do
+    PKCS11_SOURCES=https://www.cryptsoft.com/pkcs11doc/STANDARD/include/v211
+    for f in $(wget -qO- ${PKCS11_SOURCES} 2>&1 | html2 | sed -n 's,.*/a/@href=\(.*\.h\)$,\1,gp'); do
         if test -f "${f##*/}"; then
           rm "${f##*/}"
         fi
-        wget --unlink $f
+        wget --unlink ${PKCS11_SOURCES}/${f}
         if ! test -f "${f##*/}"; then
             AC_MSG_ERROR([download failed of pkcs11 header file: $f])
         fi