fix solaris build

Before this patch the build failure looked like:
    ...
    ../../deps/zlib/inftrees.c:330: warning: visibility attribute not supported in this configuration; ignored
    ...
    ld: fatal: relocation error: R_386_GOTOFF: file deps/zlib/deflate.c.0.o: symbol zcfree: a GOT relative relocation must reference a local symbol
    ...

wscript

@@ -65,6 +65,9 @@ def configure(conf):
     else:
         conf.env.PLATFORM = 'unix'
 
+    if conf.env.DEST_OS == 'sunos':
+        conf.env.DEFINES += ['NO_VIZ']
+
     if conf.options.threadsafe:
         if conf.env.PLATFORM == 'unix':
             conf.check_cc(lib='pthread', uselib_store='pthread')