Move tightQualityLevel out of the JPEG specific part

The variable tightQualityLevel is used for ZYWRLE compression, too,
so if libjpeg is not present, but libz is, we still need to have
that struct member.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

libvncserver/rfbserver.c

@@ -369,9 +369,9 @@ rfbNewTCPOrUDPClient(rfbScreenInfoPtr rfbScreen,
       UNLOCK(rfbClientListMutex);
 
 #ifdef LIBVNCSERVER_HAVE_LIBZ
+      cl->tightQualityLevel = -1;
 #ifdef LIBVNCSERVER_HAVE_LIBJPEG
       cl->tightCompressLevel = TIGHT_DEFAULT_COMPRESSION;
-      cl->tightQualityLevel = -1;
       {
 	int i;
 	for (i = 0; i < 4; i++)
@@ -2004,12 +2004,12 @@ rfbProcessClientNormalMessage(rfbClientPtr cl)
 		    cl->tightCompressLevel = enc & 0x0F;
 		    rfbLog("Using compression level %d for client %s\n",
 			   cl->tightCompressLevel, cl->host);
+#endif
 		} else if ( enc >= (uint32_t)rfbEncodingQualityLevel0 &&
 			    enc <= (uint32_t)rfbEncodingQualityLevel9 ) {
 		    cl->tightQualityLevel = enc & 0x0F;
 		    rfbLog("Using image quality level %d for client %s\n",
 			   cl->tightQualityLevel, cl->host);
-#endif
 		} else
 #endif
 		{

rfb/rfb.h

@@ -525,6 +525,8 @@ typedef struct _rfbClientRec {
     struct z_stream_s compStream;
     rfbBool compStreamInited;
     uint32_t zlibCompressLevel;
+    /* the quality level is also used by ZYWRLE */
+    int tightQualityLevel;
 
 #ifdef LIBVNCSERVER_HAVE_LIBJPEG
     /* tight encoding -- preserve zlib streams' state for each client */
@@ -532,7 +534,6 @@ typedef struct _rfbClientRec {
     rfbBool zsActive[4];
     int zsLevel[4];
     int tightCompressLevel;
-    int tightQualityLevel;
 #endif
 #endif