Add --without-ssl configure option

wscript

@@ -38,6 +38,12 @@ def set_options(opt):
                 , help='Build using system libraries and headers (like a debian build) [Default: False]'
                 , dest='system'
                 )
+  opt.add_option( '--without-ssl'
+                , action='store_true'
+                , default=False
+                , help='Build without SSL'
+                , dest='without_ssl'
+                )
 
 def configure(conf):
   conf.check_tool('compiler_cxx')
@@ -68,6 +74,7 @@ def configure(conf):
     if sys.platform.startswith("freebsd"):
       conf.fatal("Install the libexecinfo port from /usr/ports/devel/libexecinfo.")
 
+  if not Options.options.without_ssl:
     if conf.check_cfg(package='openssl',
                       args='--cflags --libs',
                       uselib_store='OPENSSL'):