Remove gcc-specific __label__

Use unique names and ditch the local label declaration. Visual Studio
does not support it.

https://code.google.com/p/webm/issues/detail?id=561

Change-Id: Ica643cf5abb56ee6156371f5bf73fdeb58014422

vp8/encoder/x86/quantize_sse2.c

@@ -22,16 +22,15 @@
 
 #define SELECT_EOB(i, z) \
     do { \
-        __label__ select_eob_end; \
         short boost = *zbin_boost_ptr; \
         int cmp = (x[z] < boost) | (y[z] == 0); \
         zbin_boost_ptr++; \
         if (cmp) \
-            goto select_eob_end; \
+            goto select_eob_end_##i; \
         qcoeff_ptr[z] = y[z]; \
         eob = i; \
         zbin_boost_ptr = b->zrun_zbin_boost; \
-        select_eob_end:; \
+        select_eob_end_##i:; \
     } while (0)
 
 void vp8_regular_quantize_b_sse2(BLOCK *b, BLOCKD *d)