libvncserver: replace LIBVNCSERVER_WORDS_BIGENDIAN with WORDS_BIGENDIAN

since macro AC_C_BIGENDIAN is used in autoconf and WORDS_BIGENDIAN is
automatically set for different arch, it is better to use WORDS_BIGENDIAN
instead of LIBVNCSERVER_WORDS_BIGENDIAN, which cuase issue in mips.

Signed-off-by: Yu Ke <ke.yu@intel.com>

Upstream-Status: Pending

diff --git a/libvncserver/main.c b/libvncserver/main.c
index b6bd930..8bbb7bf 100644
--- a/libvncserver/main.c
+++ b/libvncserver/main.c
@@ -47,7 +47,7 @@ static MUTEX(extMutex);
 
 static int rfbEnableLogging=1;
 
-#ifdef LIBVNCSERVER_WORDS_BIGENDIAN
+#ifdef WORDS_BIGENDIAN
 char rfbEndianTest = (1==0);
 #else
 char rfbEndianTest = (1==1);