target-ppc: disable single stepping

... which left was enabled by mistake.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5918 c046a42c-6fe2-441c-8c8c-71466251a162

target-ppc/translate.c

@@ -38,7 +38,7 @@
 #define GDBSTUB_SINGLE_STEP 0x4
 
 /* Include definitions for instructions classes and implementations flags */
-#define DO_SINGLE_STEP
+//#define DO_SINGLE_STEP
 //#define PPC_DEBUG_DISAS
 //#define DO_PPC_STATISTICS
 //#define OPTIMIZE_FPRF_UPDATE