target-i386: Enable SSSE3 TCG support

SSSE3 support has been added to TCG more than 4 years ago in commit
4242b1bd. It has been disabled by
mistake in commit 551a2dec.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: NAndreas Färber <afaerber@suse.de>

target-i386/cpu.c

@@ -315,7 +315,7 @@ typedef struct x86_def_t {
           /* missing:
           CPUID_VME, CPUID_DTS, CPUID_SS, CPUID_HT, CPUID_TM, CPUID_PBE */
 #define TCG_EXT_FEATURES (CPUID_EXT_SSE3 | CPUID_EXT_MONITOR | \
-          CPUID_EXT_CX16 | CPUID_EXT_POPCNT | \
+          CPUID_EXT_SSSE3 | CPUID_EXT_CX16 | CPUID_EXT_POPCNT | \
           CPUID_EXT_HYPERVISOR)
           /* missing:
           CPUID_EXT_DTES64, CPUID_EXT_DSCPL, CPUID_EXT_VMX, CPUID_EXT_EST,