updated ENC624j6net driver

- fixes to gcc native and cross compilation settings
  - implemented hardware based multicast filtering hashes, resulting
    in less unwanted traffic to our Amigas (especially Bonjour, UPNP and such)
  - MULTICAST option in envarc:sana2/enc624j6net.config will now
    allow all multicast traffic as opposed to the default fine grained
    filtering behaviour

Driver/baxnet/README.enc

@@ -44,6 +44,8 @@ PRIORITY=PRI/K/N,BPS/K/N,MTU/K/N,FULLDUPLEX/S,FLOWCONTROL/S,TIMER/K/N,MULTICAST/
                   note: this switch should not be enabled in normal cases.
                         The module features autoconfiguration that determines
                         speed and duplex automatically.
+                  note(2): see miitool for changing speed/duplex
+                           settings at runtime.
 
  PRIORITY       - server task priority (default 1)
 
@@ -51,8 +53,8 @@ PRIORITY=PRI/K/N,BPS/K/N,MTU/K/N,FULLDUPLEX/S,FLOWCONTROL/S,TIMER/K/N,MULTICAST/
 
  MTU            - maximum transmission unit (default 1500) 
 
- MULTICAST      - obsolete, kept for config file backwards compatibility with 
-                  old driver
+ MULTICAST      - (V2.3+) override fine-grained automatic multicast filtering
+                  and accept all multicast frames (default: off)
 
  FLOWCONTROL    - enable automatic flow control that throttles incoming
                   data when the hardware buffer gets full
@@ -64,6 +66,8 @@ PRIORITY=PRI/K/N,BPS/K/N,MTU/K/N,FULLDUPLEX/S,FLOWCONTROL/S,TIMER/K/N,MULTICAST/
 Changelog:
 ----------
 
+2.3   - implemented fine grained multicast filter hashes
+
 2.2   - some more tuning to RX/TX scheduling
       - added optional debug code to lowlevel routines
       - removed some obsolete bus transfers
@@ -110,11 +114,12 @@ Changelog:
 Compilation / Development Notes
 -------------------------------
 
-Either VBCC or GCC (tested with version 2.95 only) can be used. General
-options for compiler usage can be found in Common.mk. Also, you might want
-to adapt the paths to your setup (PREFX,SYSINC). In addition to the regular
-NDK, the sana2.h is expected in the devices/ subdir of the includes. sana2.h
-may be found in the AmiTCP or Roadshow SDK, respectively.
+Either VBCC or GCC (tested with version 2.95 only) can be used for 
+cross-compiles. General options for compiler usage can be found in 
+Common.mk. Also, you might want to adapt the paths to your setup 
+(PREFX,SYSINC). In addition to the regular NDK, the sana2.h is expected 
+in the devices/ subdir of the includes. sana2.h may be found in the 
+AmiTCP or Roadshow SDK, respectively.
 
 Call
 
@@ -125,6 +130,15 @@ for building the device.
 VBCC note: When calling the GNU Make port supplied with ADE/GG natively on AmigaOS3, 
 please make sure that "vc" is within the search path of "/bin/sh".
 
+Native compilation is also supported for GCC and VBCC. In addition, SAS/C
+smakefiles are provided for the hardware targets.
+
+Call 
+
+ smake -f smakefile.enc
+
+for native building with SAS/C.
+
 Conceptually, the driver was meant to support multiple hardware targets. Therefore,
 it features a SANA-II frontend (device.c,deviceheader.c,deviceinit.c), a main
 server running in a task (server.c) and several hardware backends. A new hardware