configure: enable mttcg for i386 and x86_64

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -7024,12 +7024,14 @@ TARGET_ABI_DIR=""
 
 case "$target_name" in
   i386)
+    mttcg="yes"
     gdb_xml_files="i386-32bit.xml i386-32bit-core.xml i386-32bit-sse.xml"
     target_compiler=$cross_cc_i386
     target_compiler_cflags=$cross_cc_ccflags_i386
   ;;
   x86_64)
     TARGET_BASE_ARCH=i386
+    mttcg="yes"
     gdb_xml_files="i386-64bit.xml i386-64bit-core.xml i386-64bit-sse.xml"
     target_compiler=$cross_cc_x86_64
   ;;