wscript: Fix FTBFS on kFreeBSD and Hurd

Tested by Debian on hurd-i386, kfreebsd-amd64 and kfreebsd-i386.

wscript

@@ -79,10 +79,15 @@ def options(opt):
     opt.sub_options('dbus')
 
 def configure(conf):
+    conf.load('compiler_cxx')
+    conf.load('compiler_cc')
     platform = sys.platform
     conf.env['IS_MACOSX'] = platform == 'darwin'
     conf.env['IS_LINUX'] = platform == 'linux' or platform == 'linux2' or platform == 'posix'
     conf.env['IS_SUN'] = platform == 'sunos'
+    # GNU/kFreeBSD and GNU/Hurd are treated as Linux
+    if platform.startswith('gnu0') or platform.startswith('gnukfreebsd'):
+        conf.env['IS_LINUX'] = True
 
     if conf.env['IS_LINUX']:
         Logs.pprint('CYAN', "Linux detected")